78631 has 8 divisors (see below), whose sum is σ = 92160. Its totient is φ = 65688.

The previous prime is 78623. The next prime is 78643. The reversal of 78631 is 13687.

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

It is not a de Polignac number, because 78631 - 2³ = 78623 is a prime.

It is a super-2 number, since 2×78631² = 12365668322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78596 and 78605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78691) 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, 210 + ... + 448.

It is an arithmetic number, because the mean of its divisors is an integer number (11520).

2⁷⁸⁶³¹ is an apocalyptic number.

78631 is a deficient number, since it is larger than the sum of its proper divisors (13529).

78631 is a wasteful number, since it uses less digits than its factorization.

78631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293.

The product of its digits is 1008, while the sum is 25.

The square root of 78631 is about 280.4121965964. The cubic root of 78631 is about 42.8414932279.

Subtracting from 78631 its sum of digits (25), we obtain a triangular number (78606 = T₃₉₆).

The spelling of 78631 in words is "seventy-eight thousand, six hundred thirty-one".