78164121 has 8 divisors (see below), whose sum is σ = 119107264. Its totient is φ = 44665200.

The previous prime is 78164087. The next prime is 78164129. The reversal of 78164121 is 12146187.

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

It is not a de Polignac number, because 78164121 - 2¹⁵ = 78131353 is a prime.

It is a super-2 number, since 2×78164121² = 12219259623405282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78164129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1861030 + ... + 1861071.

It is an arithmetic number, because the mean of its divisors is an integer number (14888408).

Almost surely, 2^78164121 is an apocalyptic number.

It is an amenable number.

78164121 is a deficient number, since it is larger than the sum of its proper divisors (40943143).

78164121 is a wasteful number, since it uses less digits than its factorization.

78164121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3722111.

The product of its digits is 2688, while the sum is 30.

The square root of 78164121 is about 8841.0475058106. The cubic root of 78164121 is about 427.5653304623.

The spelling of 78164121 in words is "seventy-eight million, one hundred sixty-four thousand, one hundred twenty-one".