79638877240 has 384 divisors, whose sum is σ = 214402204800. Its totient is φ = 26555443200.

The previous prime is 79638877231. The next prime is 79638877243. The reversal of 79638877240 is 4277883697.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79638877243) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1942411620 + ... + 1942411660.

It is an arithmetic number, because the mean of its divisors is an integer number (558339075).

Almost surely, 2^79638877240 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 79638877240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107201102400).

79638877240 is an abundant number, since it is smaller than the sum of its proper divisors (134763327560).

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

79638877240 is a wasteful number, since it uses less digits than its factorization.

79638877240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176 (or 115 counting only the distinct ones).

The product of its (nonzero) digits is 28449792, while the sum is 61.

The spelling of 79638877240 in words is "seventy-nine billion, six hundred thirty-eight million, eight hundred seventy-seven thousand, two hundred forty".