78536631 has 8 divisors (see below), whose sum is σ = 104767360. Its totient is φ = 52331832.

The previous prime is 78536629. The next prime is 78536641. The reversal of 78536631 is 13663587.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78536631 - 2¹ = 78536629 is a prime.

It is a super-2 number, since 2×78536631² = 12336004817660322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78536631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78536641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2280 + ... + 12738.

It is an arithmetic number, because the mean of its divisors is an integer number (13095920).

Almost surely, 2^78536631 is an apocalyptic number.

78536631 is a deficient number, since it is larger than the sum of its proper divisors (26230729).

78536631 is a wasteful number, since it uses less digits than its factorization.

78536631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12965.

The product of its digits is 90720, while the sum is 39.

The square root of 78536631 is about 8862.0895391550. The cubic root of 78536631 is about 428.2434762664.

The spelling of 78536631 in words is "seventy-eight million, five hundred thirty-six thousand, six hundred thirty-one".