78522631 has 8 divisors (see below), whose sum is σ = 86031504. Its totient is φ = 71075520.

The previous prime is 78522607. The next prime is 78522641. The reversal of 78522631 is 13622587.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 78522631 - 2⁵ = 78522599 is a prime.

It is a super-2 number, since 2×78522631² = 12331607158324322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78522641) 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, 12756 + ... + 17881.

It is an arithmetic number, because the mean of its divisors is an integer number (10753938).

Almost surely, 2^78522631 is an apocalyptic number.

78522631 is a deficient number, since it is larger than the sum of its proper divisors (7508873).

78522631 is a wasteful number, since it uses less digits than its factorization.

78522631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30881.

The product of its digits is 20160, while the sum is 34.

The square root of 78522631 is about 8861.2996225159. The cubic root of 78522631 is about 428.2180284175.

The spelling of 78522631 in words is "seventy-eight million, five hundred twenty-two thousand, six hundred thirty-one".