31402664 has 16 divisors (see below), whose sum is σ = 59072820. Its totient is φ = 15649920.

The previous prime is 31402663. The next prime is 31402703. The reversal of 31402664 is 46620413.

It can be written as a sum of positive squares in 2 ways, for example, as 30713764 + 688900 = 5542^2 + 830^2 .

It is a super-2 number, since 2×31402664² = 1972254612593792, which contains 22 as substring.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (31402663) 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, 3767 + ... + 8774.

Almost surely, 2^31402664 is an apocalyptic number.

It is an amenable number.

31402664 is a deficient number, since it is larger than the sum of its proper divisors (27670156).

31402664 is a wasteful number, since it uses less digits than its factorization.

31402664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12860 (or 12856 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 31402664 is about 5603.8079910004. The cubic root of 31402664 is about 315.4923483870.

The spelling of 31402664 in words is "thirty-one million, four hundred two thousand, six hundred sixty-four".