79891329840 has 160 divisors (see below), whose sum is σ = 295349953536. Its totient is φ = 17466915840.

The previous prime is 79891329839. The next prime is 79891329857. The reversal of 79891329840 is 4892319897.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 995151 + ... + 1072430.

Almost surely, 2^79891329840 is an apocalyptic number.

79891329840 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

79891329840 is an abundant number, since it is smaller than the sum of its proper divisors (215458623696).

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

79891329840 is a wasteful number, since it uses less digits than its factorization.

79891329840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2067627 (or 2067621 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 60.

The spelling of 79891329840 in words is "seventy-nine billion, eight hundred ninety-one million, three hundred twenty-nine thousand, eight hundred forty".