78365601 has 6 divisors (see below), whose sum is σ = 113194770. Its totient is φ = 52243728.

The previous prime is 78365533. The next prime is 78365653. The reversal of 78365601 is 10656387.

It can be written as a sum of positive squares in only one way, i.e., 70157376 + 8208225 = 8376^2 + 2865^2 .

It is not a de Polignac number, because 78365601 - 2¹⁷ = 78234529 is a prime.

It is a super-2 number, since 2×78365601² = 12282334840182402, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78365681) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 4353636 + ... + 4353653.

It is an arithmetic number, because the mean of its divisors is an integer number (18865795).

Almost surely, 2^78365601 is an apocalyptic number.

It is an amenable number.

78365601 is a deficient number, since it is larger than the sum of its proper divisors (34829169).

78365601 is a wasteful number, since it uses less digits than its factorization.

78365601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8707295 (or 8707292 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 78365601 is about 8852.4347498301. The cubic root of 78365601 is about 427.9323869815.

The spelling of 78365601 in words is "seventy-eight million, three hundred sixty-five thousand, six hundred one".