164219868 has 18 divisors (see below), whose sum is σ = 415111424. Its totient is φ = 54739944.

The previous prime is 164219857. The next prime is 164219879. The reversal of 164219868 is 868912461.

It is an interprime number because it is at equal distance from previous prime (164219857) and next prime (164219879).

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2280796 + ... + 2280867.

Almost surely, 2^164219868 is an apocalyptic number.

164219868 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

164219868 is an abundant number, since it is smaller than the sum of its proper divisors (250891556).

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

164219868 is a wasteful number, since it uses less digits than its factorization.

164219868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4561673 (or 4561668 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 164219868 is about 12814.8300027741. The cubic root of 164219868 is about 547.6148704993.

The spelling of 164219868 in words is "one hundred sixty-four million, two hundred nineteen thousand, eight hundred sixty-eight".