31872890 has 32 divisors (see below), whose sum is σ = 67098240. Its totient is φ = 10672704.

The previous prime is 31872889. The next prime is 31872901. The reversal of 31872890 is 9827813.

31872890 = T₁₁₉₆ + T₁₁₉₇ + ... + T₁₂₃₈.

It is a super-2 number, since 2×31872890² = 2031762233904200, 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, 2285 + ... + 8304.

It is an arithmetic number, because the mean of its divisors is an integer number (2096820).

Almost surely, 2^31872890 is an apocalyptic number.

31872890 is an abundant number, since it is smaller than the sum of its proper divisors (35225350).

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

31872890 is a wasteful number, since it uses less digits than its factorization.

31872890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10646.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 31872890 is about 5645.6080274847. The cubic root of 31872890 is about 317.0592889333.

The spelling of 31872890 in words is "thirty-one million, eight hundred seventy-two thousand, eight hundred ninety".