164215840 has 48 divisors (see below), whose sum is σ = 388862208. Its totient is φ = 65533696.

The previous prime is 164215823. The next prime is 164215871. The reversal of 164215840 is 48512461.

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, 89169 + ... + 90991.

It is an arithmetic number, because the mean of its divisors is an integer number (8101296).

Almost surely, 2^164215840 is an apocalyptic number.

164215840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

164215840 is an abundant number, since it is smaller than the sum of its proper divisors (224646368).

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

164215840 is a wasteful number, since it uses less digits than its factorization.

164215840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2401 (or 2393 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 164215840 is about 12814.6728401470. The cubic root of 164215840 is about 547.6103931468.

The spelling of 164215840 in words is "one hundred sixty-four million, two hundred fifteen thousand, eight hundred forty".