31628130 has 64 divisors (see below), whose sum is σ = 78382080. Its totient is φ = 8164544.

The previous prime is 31628101. The next prime is 31628161. The reversal of 31628130 is 3182613.

It is a self number, because there is not a number n which added to its sum of digits gives 31628130.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 189307 + ... + 189473.

It is an arithmetic number, because the mean of its divisors is an integer number (1224720).

Almost surely, 2^31628130 is an apocalyptic number.

31628130 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31628130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39191040).

31628130 is an abundant number, since it is smaller than the sum of its proper divisors (46753950).

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

31628130 is a wasteful number, since it uses less digits than its factorization.

31628130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 31628130 is about 5623.8892236601. The cubic root of 31628130 is about 316.2456096710.

The spelling of 31628130 in words is "thirty-one million, six hundred twenty-eight thousand, one hundred thirty".