164420978 has 6 divisors (see below), whose sum is σ = 246658671. Its totient is φ = 82201422.

The previous prime is 164420953. The next prime is 164420983. The reversal of 164420978 is 879024461.

It can be written as a sum of positive squares in only one way, i.e., 82210489 + 82210489 = 9067^2 + 9067^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=9067.

It is a super-3 number, since 3×164420978³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 13601 + ... + 22667.

Almost surely, 2^164420978 is an apocalyptic number.

164420978 is a deficient number, since it is larger than the sum of its proper divisors (82237693).

164420978 is an frugal number, since it uses more digits than its factorization.

164420978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18136 (or 9069 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 164420978 is about 12822.6743700369. The cubic root of 164420978 is about 547.8383227561.

It can be divided in two parts, 1644 and 20978, that added together give a palindrome (22622).

The spelling of 164420978 in words is "one hundred sixty-four million, four hundred twenty thousand, nine hundred seventy-eight".