31352490 has 96 divisors (see below), whose sum is σ = 88897536. Its totient is φ = 7620480.

The previous prime is 31352467. The next prime is 31352507. The reversal of 31352490 is 9425313.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 148485 + ... + 148695.

It is an arithmetic number, because the mean of its divisors is an integer number (926016).

Almost surely, 2^31352490 is an apocalyptic number.

31352490 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31352490 is the 4572-nd pentagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31352490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44448768).

31352490 is an abundant number, since it is smaller than the sum of its proper divisors (57545046).

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

31352490 is a wasteful number, since it uses less digits than its factorization.

31352490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364 (or 361 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 31352490 is about 5599.3294241364. The cubic root of 31352490 is about 315.3242315336.

It can be divided in two parts, 3135 and 2490, that added together give a square (5625 = 75²).

The spelling of 31352490 in words is "thirty-one million, three hundred fifty-two thousand, four hundred ninety".