31461472 has 24 divisors (see below), whose sum is σ = 70788816. Its totient is φ = 13483392.

The previous prime is 31461457. The next prime is 31461481. The reversal of 31461472 is 27416413.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 31461472.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70003 + ... + 70450.

It is an arithmetic number, because the mean of its divisors is an integer number (2949534).

Almost surely, 2^31461472 is an apocalyptic number.

31461472 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31461472 is an abundant number, since it is smaller than the sum of its proper divisors (39327344).

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

31461472 is a wasteful number, since it uses less digits than its factorization.

31461472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140470 (or 140462 counting only the distinct ones).

The product of its digits is 4032, while the sum is 28.

The square root of 31461472 is about 5609.0526829403. The cubic root of 31461472 is about 315.6891671910.

Adding to 31461472 its reverse (27416413), we get a palindrome (58877885).

The spelling of 31461472 in words is "thirty-one million, four hundred sixty-one thousand, four hundred seventy-two".