31644492738 has 16 divisors (see below), whose sum is σ = 63343046496. Its totient is φ = 10539154080.

The previous prime is 31644492701. The next prime is 31644492749. The reversal of 31644492738 is 83729444613.

It is a happy 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 in 7 ways as a sum of consecutive naturals, for example, 2244931 + ... + 2258982.

It is an arithmetic number, because the mean of its divisors is an integer number (3958940406).

Almost surely, 2^31644492738 is an apocalyptic number.

31644492738 is an abundant number, since it is smaller than the sum of its proper divisors (31698553758).

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

31644492738 is a wasteful number, since it uses less digits than its factorization.

31644492738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4505089.

The product of its digits is 3483648, while the sum is 51.

The spelling of 31644492738 in words is "thirty-one billion, six hundred forty-four million, four hundred ninety-two thousand, seven hundred thirty-eight".