31422816 has 96 divisors (see below), whose sum is σ = 92988000. Its totient is φ = 10450944.

The previous prime is 31422793. The next prime is 31422829. The reversal of 31422816 is 61822413.

It is a tau number, because it is divible by the number of its divisors (96).

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

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

It is a self number, because there is not a number n which added to its sum of digits gives 31422816.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69760 + ... + 70208.

It is an arithmetic number, because the mean of its divisors is an integer number (968625).

Almost surely, 2^31422816 is an apocalyptic number.

31422816 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 31422816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46494000).

31422816 is an abundant number, since it is smaller than the sum of its proper divisors (61565184).

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

31422816 is an frugal number, since it uses more digits than its factorization.

31422816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480 (or 454 counting only the distinct ones).

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

The square root of 31422816 is about 5605.6057656599. The cubic root of 31422816 is about 315.5598208186.

The spelling of 31422816 in words is "thirty-one million, four hundred twenty-two thousand, eight hundred sixteen".