31613604 has 48 divisors (see below), whose sum is σ = 81096960. Its totient is φ = 9505440.

The previous prime is 31613581. The next prime is 31613623. The reversal of 31613604 is 40631613.

It is a super-3 number, since 3×31613604³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17487 + ... + 19209.

It is an arithmetic number, because the mean of its divisors is an integer number (1689520).

Almost surely, 2^31613604 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31613604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40548480).

31613604 is an abundant number, since it is smaller than the sum of its proper divisors (49483356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31613604 is a wasteful number, since it uses less digits than its factorization.

31613604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1880 (or 1878 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 31613604 is about 5622.5976203175. The cubic root of 31613604 is about 316.1971877212.

Subtracting 31613604 from its reverse (40631613), we obtain a square (9018009 = 3003²).

The spelling of 31613604 in words is "thirty-one million, six hundred thirteen thousand, six hundred four".