78606631 has 4 divisors (see below), whose sum is σ = 78677752. Its totient is φ = 78535512.

The previous prime is 78606581. The next prime is 78606643. The reversal of 78606631 is 13660687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13660687 = 887 ⋅15401.

It is a cyclic number.

It is not a de Polignac number, because 78606631 - 2⁷ = 78606503 is a prime.

It is a super-2 number, since 2×78606631² = 12358004874340322, 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 (78606131) 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, 33876 + ... + 36121.

It is an arithmetic number, because the mean of its divisors is an integer number (19669438).

Almost surely, 2^78606631 is an apocalyptic number.

78606631 is a deficient number, since it is larger than the sum of its proper divisors (71121).

78606631 is a wasteful number, since it uses less digits than its factorization.

78606631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71120.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 78606631 is about 8866.0380666902. The cubic root of 78606631 is about 428.3706701679.

The spelling of 78606631 in words is "seventy-eight million, six hundred six thousand, six hundred thirty-one".