31328136 has 96 divisors (see below), whose sum is σ = 98654400. Its totient is φ = 8795520.

The previous prime is 31328117. The next prime is 31328137. The reversal of 31328136 is 63182313.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (31328137) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30235 + ... + 31253.

It is an arithmetic number, because the mean of its divisors is an integer number (1027650).

Almost surely, 2^31328136 is an apocalyptic number.

31328136 is a gapful number since it is divisible by the number (36) 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 31328136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49327200).

31328136 is an abundant number, since it is smaller than the sum of its proper divisors (67326264).

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

31328136 is a wasteful number, since it uses less digits than its factorization.

31328136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099 (or 1092 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 31328136 is about 5597.1542769518. The cubic root of 31328136 is about 315.2425644890.

The spelling of 31328136 in words is "thirty-one million, three hundred twenty-eight thousand, one hundred thirty-six".