164078690 has 8 divisors (see below), whose sum is σ = 295341660. Its totient is φ = 65631472.

The previous prime is 164078687. The next prime is 164078731. The reversal of 164078690 is 96870461.

It can be written as a sum of positive squares in 2 ways, for example, as 149646289 + 14432401 = 12233^2 + 3799^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×164078690² = 53843633024232200, 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 3 ways as a sum of consecutive naturals, for example, 8203925 + ... + 8203944.

Almost surely, 2^164078690 is an apocalyptic number.

164078690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

164078690 is a deficient number, since it is larger than the sum of its proper divisors (131262970).

164078690 is a wasteful number, since it uses less digits than its factorization.

164078690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16407876.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 164078690 is about 12809.3204347459. The cubic root of 164078690 is about 547.4578993641.

The spelling of 164078690 in words is "one hundred sixty-four million, seventy-eight thousand, six hundred ninety".