78992550 has 192 divisors, whose sum is σ = 268316160. Its totient is φ = 16640640.

The previous prime is 78992513. The next prime is 78992567. The reversal of 78992550 is 5529987.

It is a happy number.

78992550 is a `hidden beast` number, since 7 + 8 + 9 + 92 + 550 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 78992496 and 78992505.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 122529 + ... + 123171.

It is an arithmetic number, because the mean of its divisors is an integer number (1397480).

Almost surely, 2^78992550 is an apocalyptic number.

78992550 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 78992550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134158080).

78992550 is an abundant number, since it is smaller than the sum of its proper divisors (189323610).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78992550 is a wasteful number, since it uses less digits than its factorization.

78992550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684 (or 673 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 45.

The square root of 78992550 is about 8887.7753121915. The cubic root of 78992550 is about 429.0705541937.

It can be divided in two parts, 789 and 92550, that added together give a palindrome (93339).

The spelling of 78992550 in words is "seventy-eight million, nine hundred ninety-two thousand, five hundred fifty".