31162428 has 96 divisors (see below), whose sum is σ = 93381120. Its totient is φ = 8881920.

The previous prime is 31162427. The next prime is 31162477. The reversal of 31162428 is 82426113.

31162428 is a `hidden beast` number, since 3 + 11 + 624 + 28 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31162421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19425 + ... + 20967.

It is an arithmetic number, because the mean of its divisors is an integer number (972720).

Almost surely, 2^31162428 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 31162428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46690560).

31162428 is an abundant number, since it is smaller than the sum of its proper divisors (62218692).

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

31162428 is a wasteful number, since it uses less digits than its factorization.

31162428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1584 (or 1576 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 31162428 is about 5582.3317708642. The cubic root of 31162428 is about 314.6857637273.

The spelling of 31162428 in words is "thirty-one million, one hundred sixty-two thousand, four hundred twenty-eight".