31109628 has 24 divisors (see below), whose sum is σ = 79188480. Its totient is φ = 9427120.

The previous prime is 31109627. The next prime is 31109657. The reversal of 31109628 is 82690113.

It is a junction number, because it is equal to n+sod(n) for n = 31109595 and 31109604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31109621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117708 + ... + 117971.

It is an arithmetic number, because the mean of its divisors is an integer number (3299520).

Almost surely, 2^31109628 is an apocalyptic number.

It is an amenable number.

31109628 is an abundant number, since it is smaller than the sum of its proper divisors (48078852).

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

31109628 is a wasteful number, since it uses less digits than its factorization.

31109628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235697 (or 235695 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 31109628 is about 5577.6005593804. The cubic root of 31109628 is about 314.5079341814.

The spelling of 31109628 in words is "thirty-one million, one hundred nine thousand, six hundred twenty-eight".