31890074 has 4 divisors (see below), whose sum is σ = 47835114. Its totient is φ = 15945036.

The previous prime is 31890073. The next prime is 31890091. The reversal of 31890074 is 47009813.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 29084449 + 2805625 = 5393^2 + 1675^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31890074.

It is not an unprimeable number, because it can be changed into a prime (31890071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7972517 + ... + 7972520.

Almost surely, 2^31890074 is an apocalyptic number.

31890074 is a deficient number, since it is larger than the sum of its proper divisors (15945040).

31890074 is a wasteful number, since it uses less digits than its factorization.

31890074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15945039.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 31890074 is about 5647.1297134031. The cubic root of 31890074 is about 317.1162586440.

Adding to 31890074 its reverse (47009813), we get a palindrome (78899887).

The spelling of 31890074 in words is "thirty-one million, eight hundred ninety thousand, seventy-four".