78366231 has 8 divisors (see below), whose sum is σ = 116098160. Its totient is φ = 52244136.

The previous prime is 78366229. The next prime is 78366247. The reversal of 78366231 is 13266387.

It is a happy number.

It is not a de Polignac number, because 78366231 - 2¹ = 78366229 is a prime.

It is a super-2 number, since 2×78366231² = 12282532322290722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78366271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1451200 + ... + 1451253.

It is an arithmetic number, because the mean of its divisors is an integer number (14512270).

Almost surely, 2^78366231 is an apocalyptic number.

78366231 is a deficient number, since it is larger than the sum of its proper divisors (37731929).

78366231 is a wasteful number, since it uses less digits than its factorization.

78366231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2902462 (or 2902456 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 78366231 is about 8852.4703331895. The cubic root of 78366231 is about 427.9335337291.

The spelling of 78366231 in words is "seventy-eight million, three hundred sixty-six thousand, two hundred thirty-one".