31890214784 has 16 divisors (see below), whose sum is σ = 63531287520. Its totient is φ = 15945107328.

The previous prime is 31890214777. The next prime is 31890214799. The reversal of 31890214784 is 48741209813.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124571024 + ... + 124571279.

It is an arithmetic number, because the mean of its divisors is an integer number (3970705470).

Almost surely, 2^31890214784 is an apocalyptic number.

It is an amenable number.

31890214784 is a deficient number, since it is larger than the sum of its proper divisors (31641072736).

31890214784 is an equidigital number, since it uses as much as digits as its factorization.

31890214784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249142317 (or 249142305 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 47.

The spelling of 31890214784 in words is "thirty-one billion, eight hundred ninety million, two hundred fourteen thousand, seven hundred eighty-four".