31699648 has 14 divisors (see below), whose sum is σ = 62904116. Its totient is φ = 15849792.

The previous prime is 31699637. The next prime is 31699649. The reversal of 31699648 is 84699613.

It is a junction number, because it is equal to n+sod(n) for n = 31699598 and 31699607.

It is not an unprimeable number, because it can be changed into a prime (31699649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247590 + ... + 247717.

Almost surely, 2^31699648 is an apocalyptic number.

It is an amenable number.

31699648 is a deficient number, since it is larger than the sum of its proper divisors (31204468).

31699648 is an equidigital number, since it uses as much as digits as its factorization.

31699648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495319 (or 495309 counting only the distinct ones).

The product of its digits is 279936, while the sum is 46.

The square root of 31699648 is about 5630.2440444443. The cubic root of 31699648 is about 316.4837966626.

The spelling of 31699648 in words is "thirty-one million, six hundred ninety-nine thousand, six hundred forty-eight".