78748631 has 4 divisors (see below), whose sum is σ = 84806232. Its totient is φ = 72691032.

The previous prime is 78748627. The next prime is 78748639. The reversal of 78748631 is 13684787.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78748631 - 2² = 78748627 is a prime.

It is a super-2 number, since 2×78748631² = 12402693768748322, 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 (78748639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3028781 + ... + 3028806.

It is an arithmetic number, because the mean of its divisors is an integer number (21201558).

Almost surely, 2^78748631 is an apocalyptic number.

78748631 is a deficient number, since it is larger than the sum of its proper divisors (6057601).

78748631 is a wasteful number, since it uses less digits than its factorization.

78748631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6057600.

The product of its digits is 225792, while the sum is 44.

The square root of 78748631 is about 8874.0425399025. The cubic root of 78748631 is about 428.6284603097.

The spelling of 78748631 in words is "seventy-eight million, seven hundred forty-eight thousand, six hundred thirty-one".