216880940 has 24 divisors (see below), whose sum is σ = 455772912. Its totient is φ = 86690880.

The previous prime is 216880927. The next prime is 216880967. The reversal of 216880940 is 49088612.

It is a junction number, because it is equal to n+sod(n) for n = 216880894 and 216880903.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34307 + ... + 40133.

It is an arithmetic number, because the mean of its divisors is an integer number (18990538).

Almost surely, 2^216880940 is an apocalyptic number.

216880940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216880940 is an abundant number, since it is smaller than the sum of its proper divisors (238891972).

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

216880940 is a wasteful number, since it uses less digits than its factorization.

216880940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7697 (or 7695 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 216880940 is about 14726.8781484740. The cubic root of 216880940 is about 600.8145787871.

The spelling of 216880940 in words is "two hundred sixteen million, eight hundred eighty thousand, nine hundred forty".