79509642 has 16 divisors (see below), whose sum is σ = 167388960. Its totient is φ = 25108272.

The previous prime is 79509583. The next prime is 79509649. The reversal of 79509642 is 24690597.

It is a junction number, because it is equal to n+sod(n) for n = 79509594 and 79509603.

It is not an unprimeable number, because it can be changed into a prime (79509649) by changing a digit.

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, 348613 + ... + 348840.

It is an arithmetic number, because the mean of its divisors is an integer number (10461810).

Almost surely, 2^79509642 is an apocalyptic number.

79509642 is an abundant number, since it is smaller than the sum of its proper divisors (87879318).

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

79509642 is a wasteful number, since it uses less digits than its factorization.

79509642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697477.

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 79509642 is about 8916.8179301811. The cubic root of 79509642 is about 430.0047628822.

The spelling of 79509642 in words is "seventy-nine million, five hundred nine thousand, six hundred forty-two".