216957890 has 16 divisors (see below), whose sum is σ = 392923008. Its totient is φ = 86250096.

The previous prime is 216957889. The next prime is 216957911. The reversal of 216957890 is 98759612.

216957890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 64922 + ... + 68181.

It is an arithmetic number, because the mean of its divisors is an integer number (24557688).

Almost surely, 2^216957890 is an apocalyptic number.

216957890 is a deficient number, since it is larger than the sum of its proper divisors (175965118).

216957890 is a wasteful number, since it uses less digits than its factorization.

216957890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133273.

The product of its (nonzero) digits is 272160, while the sum is 47.

The square root of 216957890 is about 14729.4904867752. The cubic root of 216957890 is about 600.8856273158.

The spelling of 216957890 in words is "two hundred sixteen million, nine hundred fifty-seven thousand, eight hundred ninety".