31304745 has 32 divisors (see below), whose sum is σ = 56499840. Its totient is φ = 16441920.

The previous prime is 31304743. The next prime is 31304783. The reversal of 31304745 is 54740313.

It is not a de Polignac number, because 31304745 - 2¹ = 31304743 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31304743) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7315 + ... + 10775.

It is an arithmetic number, because the mean of its divisors is an integer number (1765620).

Almost surely, 2^31304745 is an apocalyptic number.

It is an amenable number.

31304745 is a deficient number, since it is larger than the sum of its proper divisors (25195095).

31304745 is a wasteful number, since it uses less digits than its factorization.

31304745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3542 (or 3536 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 31304745 is about 5595.0643427936. The cubic root of 31304745 is about 315.1640868462.

It can be divided in two parts, 3130 and 4745, that added together give a triangular number (7875 = T₁₂₅).

The spelling of 31304745 in words is "thirty-one million, three hundred four thousand, seven hundred forty-five".