78878631 has 16 divisors (see below), whose sum is σ = 114955904. Its totient is φ = 47814624.

The previous prime is 78878599. The next prime is 78878647. The reversal of 78878631 is 13687887.

It is not a de Polignac number, because 78878631 - 2⁵ = 78878599 is a prime.

It is a super-2 number, since 2×78878631² = 12443676856868322, 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 (78878131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12481 + ... + 17706.

It is an arithmetic number, because the mean of its divisors is an integer number (7184744).

Almost surely, 2^78878631 is an apocalyptic number.

78878631 is a deficient number, since it is larger than the sum of its proper divisors (36077273).

78878631 is a wasteful number, since it uses less digits than its factorization.

78878631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30270.

The product of its digits is 451584, while the sum is 48.

The square root of 78878631 is about 8881.3642533115. The cubic root of 78878631 is about 428.8641937864.

The spelling of 78878631 in words is "seventy-eight million, eight hundred seventy-eight thousand, six hundred thirty-one".