3121878890 has 32 divisors (see below), whose sum is σ = 6063389136. Its totient is φ = 1150456320.

The previous prime is 3121878887. The next prime is 3121878931. The reversal of 3121878890 is 988781213.

It can be written as a sum of positive squares in 8 ways, for example, as 484132009 + 2637746881 = 22003^2 + 51359^2 .

It is a super-2 number, since 2×3121878890² = 19492255607655264200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44684 + ... + 90776.

Almost surely, 2^3121878890 is an apocalyptic number.

3121878890 is a deficient number, since it is larger than the sum of its proper divisors (2941510246).

3121878890 is a wasteful number, since it uses less digits than its factorization.

3121878890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46634.

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 3121878890 is about 55873.7764071841. The cubic root of 3121878890 is about 1461.5219773217.

The spelling of 3121878890 in words is "three billion, one hundred twenty-one million, eight hundred seventy-eight thousand, eight hundred ninety".