31772130 has 64 divisors (see below), whose sum is σ = 84163968. Its totient is φ = 7626240.

The previous prime is 31772107. The next prime is 31772173. The reversal of 31772130 is 3127713.

It is a self number, because there is not a number n which added to its sum of digits gives 31772130.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14997 + ... + 16983.

It is an arithmetic number, because the mean of its divisors is an integer number (1315062).

Almost surely, 2^31772130 is an apocalyptic number.

31772130 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 31772130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42081984).

31772130 is an abundant number, since it is smaller than the sum of its proper divisors (52391838).

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

31772130 is a wasteful number, since it uses less digits than its factorization.

31772130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2051.

The product of its (nonzero) digits is 882, while the sum is 24.

The square root of 31772130 is about 5636.6772126848. The cubic root of 31772130 is about 316.7248289596.

Adding to 31772130 its reverse (3127713), we get a palindrome (34899843).

The spelling of 31772130 in words is "thirty-one million, seven hundred seventy-two thousand, one hundred thirty".