79780417938 has 64 divisors (see below), whose sum is σ = 191431900800. Its totient is φ = 24482969280.

The previous prime is 79780417933. The next prime is 79780417949. The reversal of 79780417938 is 83971408797.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (79780417931) 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, 116128 + ... + 415988.

It is an arithmetic number, because the mean of its divisors is an integer number (2991123450).

Almost surely, 2^79780417938 is an apocalyptic number.

79780417938 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 79780417938, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95715950400).

79780417938 is an abundant number, since it is smaller than the sum of its proper divisors (111651482862).

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

79780417938 is a wasteful number, since it uses less digits than its factorization.

79780417938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300264 (or 300258 counting only the distinct ones).

The product of its (nonzero) digits is 21337344, while the sum is 63.

The spelling of 79780417938 in words is "seventy-nine billion, seven hundred eighty million, four hundred seventeen thousand, nine hundred thirty-eight".