79894431064 has 128 divisors (see below), whose sum is σ = 185846169600. Its totient is φ = 31437901440.

The previous prime is 79894431061. The next prime is 79894431077. The reversal of 79894431064 is 46013449897.

It is a junction number, because it is equal to n+sod(n) for n = 79894430996 and 79894431014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79894431061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5143069 + ... + 5158579.

It is an arithmetic number, because the mean of its divisors is an integer number (1451923200).

Almost surely, 2^79894431064 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 79894431064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92923084800).

79894431064 is an abundant number, since it is smaller than the sum of its proper divisors (105951738536).

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

79894431064 is a wasteful number, since it uses less digits than its factorization.

79894431064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15693 (or 15689 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 55.

The spelling of 79894431064 in words is "seventy-nine billion, eight hundred ninety-four million, four hundred thirty-one thousand, sixty-four".