79539390 has 96 divisors (see below), whose sum is σ = 237758976. Its totient is φ = 18072000.

The previous prime is 79539349. The next prime is 79539391. The reversal of 79539390 is 9393597.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79539391) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 157879 + ... + 158381.

It is an arithmetic number, because the mean of its divisors is an integer number (2476656).

Almost surely, 2^79539390 is an apocalyptic number.

79539390 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 79539390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118879488).

79539390 is an abundant number, since it is smaller than the sum of its proper divisors (158219586).

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

79539390 is a wasteful number, since it uses less digits than its factorization.

79539390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774 (or 771 counting only the distinct ones).

The product of its (nonzero) digits is 229635, while the sum is 45.

The square root of 79539390 is about 8918.4858580367. The cubic root of 79539390 is about 430.0583839960.

The spelling of 79539390 in words is "seventy-nine million, five hundred thirty-nine thousand, three hundred ninety".