164198978 has 16 divisors (see below), whose sum is σ = 257942016. Its totient is φ = 78244320.

The previous prime is 164198941. The next prime is 164198987. The reversal of 164198978 is 879891461.

It is a super-2 number, since 2×164198978² = 53922608752488968, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6575 + ... + 19277.

It is an arithmetic number, because the mean of its divisors is an integer number (16121376).

Almost surely, 2^164198978 is an apocalyptic number.

164198978 is a deficient number, since it is larger than the sum of its proper divisors (93743038).

164198978 is a wasteful number, since it uses less digits than its factorization.

164198978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13009.

The product of its digits is 870912, while the sum is 53.

The square root of 164198978 is about 12814.0149055634. The cubic root of 164198978 is about 547.5916492738.

The spelling of 164198978 in words is "one hundred sixty-four million, one hundred ninety-eight thousand, nine hundred seventy-eight".