31148736 has 56 divisors (see below), whose sum is σ = 83996784. Its totient is φ = 10183680.

The previous prime is 31148729. The next prime is 31148749. The reversal of 31148736 is 63784113.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 31148697 and 31148706.

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, 8646 + ... + 11706.

Almost surely, 2^31148736 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 31148736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41998392).

31148736 is an abundant number, since it is smaller than the sum of its proper divisors (52848048).

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

31148736 is a wasteful number, since it uses less digits than its factorization.

31148736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3129 (or 3119 counting only the distinct ones).

The product of its digits is 12096, while the sum is 33.

The square root of 31148736 is about 5581.1052668804. The cubic root of 31148736 is about 314.6396685956.

The spelling of 31148736 in words is "thirty-one million, one hundred forty-eight thousand, seven hundred thirty-six".