78937631 has 2 divisors, whose sum is σ = 78937632. Its totient is φ = 78937630.

The previous prime is 78937627. The next prime is 78937643. The reversal of 78937631 is 13673987.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78937631 - 2² = 78937627 is a prime.

It is a super-2 number, since 2×78937631² = 12462299175784322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78937931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39468815 + 39468816.

It is an arithmetic number, because the mean of its divisors is an integer number (39468816).

Almost surely, 2^78937631 is an apocalyptic number.

78937631 is a deficient number, since it is larger than the sum of its proper divisors (1).

78937631 is an equidigital number, since it uses as much as digits as its factorization.

78937631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 44.

The square root of 78937631 is about 8884.6851941979. The cubic root of 78937631 is about 428.9710950726.

The spelling of 78937631 in words is "seventy-eight million, nine hundred thirty-seven thousand, six hundred thirty-one".