78849794520 has 384 divisors, whose sum is σ = 313209892800. Its totient is φ = 17582745600.

The previous prime is 78849794453. The next prime is 78849794533. The reversal of 78849794520 is 2549794887.

78849794520 is a `hidden beast` number, since 7 + 8 + 8 + 497 + 94 + 52 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2151550 + ... + 2187890.

Almost surely, 2^78849794520 is an apocalyptic number.

78849794520 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78849794520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156604946400).

78849794520 is an abundant number, since it is smaller than the sum of its proper divisors (234360098280).

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

78849794520 is a wasteful number, since it uses less digits than its factorization.

78849794520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36416 (or 36399 counting only the distinct ones).

The product of its (nonzero) digits is 40642560, while the sum is 63.

The spelling of 78849794520 in words is "seventy-eight billion, eight hundred forty-nine million, seven hundred ninety-four thousand, five hundred twenty".