11978638630 has 32 divisors (see below), whose sum is σ = 25307770176. Its totient is φ = 3995961984.

The previous prime is 11978638621. The next prime is 11978638649. The reversal of 11978638630 is 3683687911.

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, 2309889 + ... + 2315068.

It is an arithmetic number, because the mean of its divisors is an integer number (790867818).

Almost surely, 2^11978638630 is an apocalyptic number.

11978638630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11978638630 is an abundant number, since it is smaller than the sum of its proper divisors (13329131546).

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

11978638630 is a wasteful number, since it uses less digits than its factorization.

11978638630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4625008.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The spelling of 11978638630 in words is "eleven billion, nine hundred seventy-eight million, six hundred thirty-eight thousand, six hundred thirty".