31380164 has 24 divisors (see below), whose sum is σ = 58321368. Its totient is φ = 14722560.

The previous prime is 31380127. The next prime is 31380197. The reversal of 31380164 is 46108313.

It can be written as a sum of positive squares in 4 ways, for example, as 1459264 + 29920900 = 1208^2 + 5470^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36362 + ... + 37214.

It is an arithmetic number, because the mean of its divisors is an integer number (2430057).

Almost surely, 2^31380164 is an apocalyptic number.

31380164 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

It is an amenable number.

31380164 is a deficient number, since it is larger than the sum of its proper divisors (26941204).

31380164 is a wasteful number, since it uses less digits than its factorization.

31380164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1415 (or 1413 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 31380164 is about 5601.8000678353. The cubic root of 31380164 is about 315.4169803238.

Adding to 31380164 its reverse (46108313), we get a palindrome (77488477).

The spelling of 31380164 in words is "thirty-one million, three hundred eighty thousand, one hundred sixty-four".