31857828987076 has 9 divisors (see below), whose sum is σ = 55751220482349. Its totient is φ = 15928908849264.

The previous prime is 31857828987071. The next prime is 31857828987107. The reversal of 31857828987076 is 67078982875813.

The square root of 31857828987076 is 5644274.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 23054882402500 + 8802946584576 = 4801550^2 + 2966976^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31857828986987 and 31857828987005.

It is not an unprimeable number, because it can be changed into a prime (31857828987071) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 9877480 + ... + 12699616.

Almost surely, 2^{31857828987076} is an apocalyptic number.

31857828987076 is the 5644274-th square number.

It is an amenable number.

31857828987076 is a deficient number, since it is larger than the sum of its proper divisors (23893391495273).

31857828987076 is an frugal number, since it uses more digits than its factorization.

31857828987076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5644278 (or 2822139 counting only the distinct ones).

The product of its (nonzero) digits is 2275983360, while the sum is 79.

The spelling of 31857828987076 in words is "thirty-one trillion, eight hundred fifty-seven billion, eight hundred twenty-eight million, nine hundred eighty-seven thousand, seventy-six".