164343978 has 20 divisors (see below), whose sum is σ = 368252610. Its totient is φ = 54781272.

The previous prime is 164343953. The next prime is 164343997. The reversal of 164343978 is 879343461.

164343978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 149157369 + 15186609 = 12213^2 + 3897^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 507073 + ... + 507396.

Almost surely, 2^164343978 is an apocalyptic number.

164343978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

164343978 is an abundant number, since it is smaller than the sum of its proper divisors (203908632).

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

164343978 is a wasteful number, since it uses less digits than its factorization.

164343978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014483 (or 1014474 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 164343978 is about 12819.6715246530. The cubic root of 164343978 is about 547.7527900013.

The spelling of 164343978 in words is "one hundred sixty-four million, three hundred forty-three thousand, nine hundred seventy-eight".