79725381520 has 40 divisors (see below), whose sum is σ = 189672253056. Its totient is φ = 31148519808.

The previous prime is 79725381503. The next prime is 79725381521. The reversal of 79725381520 is 2518352797.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×79725381520² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (79725381521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11584552 + ... + 11591431.

Almost surely, 2^79725381520 is an apocalyptic number.

It is an amenable number.

79725381520 is an abundant number, since it is smaller than the sum of its proper divisors (109946871536).

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

79725381520 is a wasteful number, since it uses less digits than its factorization.

79725381520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23176039 (or 23176033 counting only the distinct ones).

The product of its (nonzero) digits is 1058400, while the sum is 49.

The spelling of 79725381520 in words is "seventy-nine billion, seven hundred twenty-five million, three hundred eighty-one thousand, five hundred twenty".