31105648 has 90 divisors (see below), whose sum is σ = 75603048. Its totient is φ = 12142080.

The previous prime is 31105639. The next prime is 31105673. The reversal of 31105648 is 84650113.

It is a super-2 number, since 2×31105648² = 1935122674999808, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1003393 + ... + 1003423.

Almost surely, 2^31105648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31105648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37801524).

31105648 is an abundant number, since it is smaller than the sum of its proper divisors (44497400).

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

31105648 is a wasteful number, since it uses less digits than its factorization.

31105648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111 (or 57 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 31105648 is about 5577.2437637242. The cubic root of 31105648 is about 314.4945214531.

Multiplying 31105648 by its sum of digits (28), we get a square (870958144 = 29512²).

31105648 divided by its sum of digits (28) gives a square (1110916 = 1054²).

The spelling of 31105648 in words is "thirty-one million, one hundred five thousand, six hundred forty-eight".