31191648 has 48 divisors (see below), whose sum is σ = 83280960. Its totient is φ = 10219136.

The previous prime is 31191631. The next prime is 31191683. The reversal of 31191648 is 84619113.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2911 + ... + 8417.

It is an arithmetic number, because the mean of its divisors is an integer number (1735020).

Almost surely, 2^31191648 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 31191648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41640480).

31191648 is an abundant number, since it is smaller than the sum of its proper divisors (52089312).

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

31191648 is a wasteful number, since it uses less digits than its factorization.

31191648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5579 (or 5571 counting only the distinct ones).

The product of its digits is 5184, while the sum is 33.

The square root of 31191648 is about 5584.9483435391. The cubic root of 31191648 is about 314.7840898861.

The spelling of 31191648 in words is "thirty-one million, one hundred ninety-one thousand, six hundred forty-eight".