31640677 has 4 divisors (see below), whose sum is σ = 32661376. Its totient is φ = 30619980.

The previous prime is 31640671. The next prime is 31640743. The reversal of 31640677 is 77604613.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77604613 = 281 ⋅276173.

It is a cyclic number.

It is not a de Polignac number, because 31640677 - 2³ = 31640669 is a prime.

It is a super-2 number, since 2×31640677² = 2002264882036658, 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 (31640671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 510303 + ... + 510364.

It is an arithmetic number, because the mean of its divisors is an integer number (8165344).

Almost surely, 2^31640677 is an apocalyptic number.

It is an amenable number.

31640677 is a deficient number, since it is larger than the sum of its proper divisors (1020699).

31640677 is a wasteful number, since it uses less digits than its factorization.

31640677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1020698.

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 31640677 is about 5625.0046222203. The cubic root of 31640677 is about 316.2874227562.

The spelling of 31640677 in words is "thirty-one million, six hundred forty thousand, six hundred seventy-seven".