31284672 has 56 divisors (see below), whose sum is σ = 83490816. Its totient is φ = 10338048.

The previous prime is 31284653. The next prime is 31284679. The reversal of 31284672 is 27648213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31284679) 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, 23743 + ... + 25025.

Almost surely, 2^31284672 is an apocalyptic number.

31284672 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31284672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41745408).

31284672 is an abundant number, since it is smaller than the sum of its proper divisors (52206144).

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

31284672 is a wasteful number, since it uses less digits than its factorization.

31284672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1425 (or 1415 counting only the distinct ones).

The product of its digits is 16128, while the sum is 33.

The square root of 31284672 is about 5593.2702419962. The cubic root of 31284672 is about 315.0967100384.

The spelling of 31284672 in words is "thirty-one million, two hundred eighty-four thousand, six hundred seventy-two".