31648657 has 8 divisors (see below), whose sum is σ = 32869800. Its totient is φ = 30436224.

The previous prime is 31648649. The next prime is 31648693. The reversal of 31648657 is 75684613.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 690561 + 30958096 = 831^2 + 5564^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 31648657 - 2³ = 31648649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31648637) 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, 5773 + ... + 9829.

It is an arithmetic number, because the mean of its divisors is an integer number (4108725).

Almost surely, 2^31648657 is an apocalyptic number.

It is an amenable number.

31648657 is a deficient number, since it is larger than the sum of its proper divisors (1221143).

31648657 is a wasteful number, since it uses less digits than its factorization.

31648657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4355.

The product of its digits is 120960, while the sum is 40.

The square root of 31648657 is about 5625.7139102517. The cubic root of 31648657 is about 316.3140104877.

The spelling of 31648657 in words is "thirty-one million, six hundred forty-eight thousand, six hundred fifty-seven".