31252890 has 32 divisors (see below), whose sum is σ = 76282560. Its totient is φ = 8192384.

The previous prime is 31252889. The next prime is 31252913. The reversal of 31252890 is 9825213.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7059 + ... + 10598.

It is an arithmetic number, because the mean of its divisors is an integer number (2383830).

Almost surely, 2^31252890 is an apocalyptic number.

31252890 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31252890 is an abundant number, since it is smaller than the sum of its proper divisors (45029670).

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

31252890 is a wasteful number, since it uses less digits than its factorization.

31252890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17726.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 31252890 is about 5590.4284272317. The cubic root of 31252890 is about 314.9899719660.

The spelling of 31252890 in words is "thirty-one million, two hundred fifty-two thousand, eight hundred ninety".