31880745 has 24 divisors (see below), whose sum is σ = 59511816. Its totient is φ = 15694848.

The previous prime is 31880743. The next prime is 31880753. The reversal of 31880745 is 54708813.

It can be written as a sum of positive squares in 4 ways, for example, as 104976 + 31775769 = 324^2 + 5637^2 .

It is not a de Polignac number, because 31880745 - 2¹ = 31880743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31880743) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26664 + ... + 27833.

It is an arithmetic number, because the mean of its divisors is an integer number (2479659).

Almost surely, 2^31880745 is an apocalyptic number.

It is an amenable number.

31880745 is a deficient number, since it is larger than the sum of its proper divisors (27631071).

31880745 is a wasteful number, since it uses less digits than its factorization.

31880745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54521 (or 54518 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 31880745 is about 5646.3036581466. The cubic root of 31880745 is about 317.0853329700.

The spelling of 31880745 in words is "thirty-one million, eight hundred eighty thousand, seven hundred forty-five".