78535121 has 32 divisors (see below), whose sum is σ = 99993600. Its totient is φ = 60134400.

The previous prime is 78535117. The next prime is 78535123. The reversal of 78535121 is 12153587.

It is a cyclic number.

It is not a de Polignac number, because 78535121 - 2² = 78535117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78535123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 224855 + ... + 225203.

It is an arithmetic number, because the mean of its divisors is an integer number (3124800).

Almost surely, 2^78535121 is an apocalyptic number.

It is an amenable number.

78535121 is a deficient number, since it is larger than the sum of its proper divisors (21458479).

78535121 is a wasteful number, since it uses less digits than its factorization.

78535121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465.

The product of its digits is 8400, while the sum is 32.

The square root of 78535121 is about 8862.0043443907. The cubic root of 78535121 is about 428.2407316796.

The spelling of 78535121 in words is "seventy-eight million, five hundred thirty-five thousand, one hundred twenty-one".