79643644000 has 96 divisors (see below), whose sum is σ = 195801514272. Its totient is φ = 31838400000.

The previous prime is 79643643991. The next prime is 79643644033. The reversal of 79643644000 is 44634697.

It is a super-2 number, since 2×79643644000² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8039050 + ... + 8048950.

It is an arithmetic number, because the mean of its divisors is an integer number (2039599107).

Almost surely, 2^79643644000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79643644000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97900757136).

79643644000 is an abundant number, since it is smaller than the sum of its proper divisors (116157870272).

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

79643644000 is a wasteful number, since it uses less digits than its factorization.

79643644000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11937 (or 11919 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 43.

The spelling of 79643644000 in words is "seventy-nine billion, six hundred forty-three million, six hundred forty-four thousand".