78245631 has 6 divisors (see below), whose sum is σ = 113021480. Its totient is φ = 52163748.

The previous prime is 78245617. The next prime is 78245653. The reversal of 78245631 is 13654287.

78245631 is a `hidden beast` number, since 78 + 24 + 563 + 1 = 666.

It is not a de Polignac number, because 78245631 - 2¹⁸ = 77983487 is a prime.

It is a super-2 number, since 2×78245631² = 12244757541176322, 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 (78245231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4346971 + ... + 4346988.

Almost surely, 2^78245631 is an apocalyptic number.

78245631 is a deficient number, since it is larger than the sum of its proper divisors (34775849).

78245631 is a wasteful number, since it uses less digits than its factorization.

78245631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8693965 (or 8693962 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 78245631 is about 8845.6560525492. The cubic root of 78245631 is about 427.7139013686.

The spelling of 78245631 in words is "seventy-eight million, two hundred forty-five thousand, six hundred thirty-one".