79021520 has 40 divisors (see below), whose sum is σ = 190065960. Its totient is φ = 30517760.

The previous prime is 79021517. The next prime is 79021531. The reversal of 79021520 is 2512097.

It can be written as a sum of positive squares in 4 ways, for example, as 238144 + 78783376 = 488^2 + 8876^2 .

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

It is a super-2 number, since 2×79021520² = 12488801246220800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 79021520.

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 7 ways as a sum of consecutive naturals, for example, 14711 + ... + 19350.

It is an arithmetic number, because the mean of its divisors is an integer number (4751649).

Almost surely, 2^79021520 is an apocalyptic number.

It is an amenable number.

79021520 is an abundant number, since it is smaller than the sum of its proper divisors (111044440).

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

79021520 is a wasteful number, since it uses less digits than its factorization.

79021520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34103 (or 34097 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 79021520 is about 8889.4049294652. The cubic root of 79021520 is about 429.1230007207.

The spelling of 79021520 in words is "seventy-nine million, twenty-one thousand, five hundred twenty".