79697520 has 300 divisors, whose sum is σ = 323276184. Its totient is φ = 18144000.

The previous prime is 79697509. The next prime is 79697521. The reversal of 79697520 is 2579697.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79697521) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 317395 + ... + 317645.

Almost surely, 2^79697520 is an apocalyptic number.

79697520 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 79697520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161638092).

79697520 is an abundant number, since it is smaller than the sum of its proper divisors (243578664).

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

79697520 is a wasteful number, since it uses less digits than its factorization.

79697520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290 (or 268 counting only the distinct ones).

The product of its (nonzero) digits is 238140, while the sum is 45.

The square root of 79697520 is about 8927.3467502948. The cubic root of 79697520 is about 430.3431909561.

The spelling of 79697520 in words is "seventy-nine million, six hundred ninety-seven thousand, five hundred twenty".