79642840 has 16 divisors (see below), whose sum is σ = 179196480. Its totient is φ = 31857120.

The previous prime is 79642817. The next prime is 79642853. The reversal of 79642840 is 4824697.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 1991071 = 79642840 / (7 + 9 + 6 + 4 + 2 + 8 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 79642793 and 79642802.

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 3 ways as a sum of consecutive naturals, for example, 995496 + ... + 995575.

It is an arithmetic number, because the mean of its divisors is an integer number (11199780).

Almost surely, 2^79642840 is an apocalyptic number.

It is an amenable number.

79642840 is an abundant number, since it is smaller than the sum of its proper divisors (99553640).

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

79642840 is a wasteful number, since it uses less digits than its factorization.

79642840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1991082 (or 1991078 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 79642840 is about 8924.2837247591. The cubic root of 79642840 is about 430.2447497948.

The spelling of 79642840 in words is "seventy-nine million, six hundred forty-two thousand, eight hundred forty".