78825631 has 4 divisors (see below), whose sum is σ = 78986664. Its totient is φ = 78664600.

The previous prime is 78825629. The next prime is 78825641. The reversal of 78825631 is 13652887.

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 78825631 - 2¹ = 78825629 is a prime.

It is a super-2 number, since 2×78825631² = 12426960205096322, 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 (78825601) 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, 79780 + ... + 80761.

It is an arithmetic number, because the mean of its divisors is an integer number (19746666).

Almost surely, 2^78825631 is an apocalyptic number.

78825631 is a deficient number, since it is larger than the sum of its proper divisors (161033).

78825631 is a wasteful number, since it uses less digits than its factorization.

78825631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161032.

The product of its digits is 80640, while the sum is 40.

The square root of 78825631 is about 8878.3799760992. The cubic root of 78825631 is about 428.7681183570.

The spelling of 78825631 in words is "seventy-eight million, eight hundred twenty-five thousand, six hundred thirty-one".