74777631 has 8 divisors (see below), whose sum is σ = 103141680. Its totient is φ = 48132672.

The previous prime is 74777609. The next prime is 74777639. The reversal of 74777631 is 13677747.

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

It is not a de Polignac number, because 74777631 - 2⁷ = 74777503 is a prime.

It is a super-2 number, since 2×74777631² = 11183388195944322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74777639) 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, 429670 + ... + 429843.

It is an arithmetic number, because the mean of its divisors is an integer number (12892710).

Almost surely, 2^74777631 is an apocalyptic number.

74777631 is a deficient number, since it is larger than the sum of its proper divisors (28364049).

74777631 is a wasteful number, since it uses less digits than its factorization.

74777631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859545.

The product of its digits is 172872, while the sum is 42.

The square root of 74777631 is about 8647.4060272431. The cubic root of 74777631 is about 421.2991349966.

The spelling of 74777631 in words is "seventy-four million, seven hundred seventy-seven thousand, six hundred thirty-one".