216619890 has 32 divisors (see below), whose sum is σ = 520724160. Its totient is φ = 57672384.

The previous prime is 216619889. The next prime is 216619891. The reversal of 216619890 is 98916612.

It is an interprime number because it is at equal distance from previous prime (216619889) and next prime (216619891).

It is a super-2 number, since 2×216619890² = 93848353487224200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216619891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14292 + ... + 25248.

It is an arithmetic number, because the mean of its divisors is an integer number (16272630).

Almost surely, 2^216619890 is an apocalyptic number.

216619890 is an abundant number, since it is smaller than the sum of its proper divisors (304104270).

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

216619890 is a wasteful number, since it uses less digits than its factorization.

216619890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11626.

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 216619890 is about 14718.0124337493. The cubic root of 216619890 is about 600.5734240225.

The spelling of 216619890 in words is "two hundred sixteen million, six hundred nineteen thousand, eight hundred ninety".