78965231 has 4 divisors (see below), whose sum is σ = 81688200. Its totient is φ = 76242264.

The previous prime is 78965209. The next prime is 78965239. The reversal of 78965231 is 13256987.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78965231 - 2⁶ = 78965167 is a prime.

It is a super-2 number, since 2×78965231² = 12471015413766722, 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 (78965239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1361441 + ... + 1361498.

It is an arithmetic number, because the mean of its divisors is an integer number (20422050).

Almost surely, 2^78965231 is an apocalyptic number.

78965231 is a deficient number, since it is larger than the sum of its proper divisors (2722969).

78965231 is a wasteful number, since it uses less digits than its factorization.

78965231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2722968.

The product of its digits is 90720, while the sum is 41.

The square root of 78965231 is about 8886.2382930012. The cubic root of 78965231 is about 429.0210848449.

The spelling of 78965231 in words is "seventy-eight million, nine hundred sixty-five thousand, two hundred thirty-one".