79837442640 has 200 divisors, whose sum is σ = 284782371720. Its totient is φ = 20714517504.

The previous prime is 79837442639. The next prime is 79837442689. The reversal of 79837442640 is 4624473897.

79837442640 is a `hidden beast` number, since 7 + 9 + 8 + 374 + 4 + 264 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 30372124176 + 49465318464 = 174276^2 + 222408^2 .

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 73266 + ... + 406254.

Almost surely, 2^79837442640 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 79837442640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142391185860).

79837442640 is an abundant number, since it is smaller than the sum of its proper divisors (204944929080).

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

79837442640 is a wasteful number, since it uses less digits than its factorization.

79837442640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333051 (or 333036 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 54.

The spelling of 79837442640 in words is "seventy-nine billion, eight hundred thirty-seven million, four hundred forty-two thousand, six hundred forty".