31604642 has 8 divisors (see below), whose sum is σ = 48301596. Its totient is φ = 15504112.

The previous prime is 31604641. The next prime is 31604647. The reversal of 31604642 is 24640613.

It can be written as a sum of positive squares in 2 ways, for example, as 27447121 + 4157521 = 5239^2 + 2039^2 .

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

It is not an unprimeable number, because it can be changed into a prime (31604641) 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, 148973 + ... + 149184.

Almost surely, 2^31604642 is an apocalyptic number.

31604642 is a deficient number, since it is larger than the sum of its proper divisors (16696954).

31604642 is a wasteful number, since it uses less digits than its factorization.

31604642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298212.

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

The square root of 31604642 is about 5621.8006012309. The cubic root of 31604642 is about 316.1673057858.

The spelling of 31604642 in words is "thirty-one million, six hundred four thousand, six hundred forty-two".