78725823 has 16 divisors (see below), whose sum is σ = 114742656. Its totient is φ = 47615840.

The previous prime is 78725821. The next prime is 78725831. The reversal of 78725823 is 32852787.

It is a cyclic number.

It is not a de Polignac number, because 78725823 - 2¹ = 78725821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78725821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16240 + ... + 20522.

It is an arithmetic number, because the mean of its divisors is an integer number (7171416).

Almost surely, 2^78725823 is an apocalyptic number.

78725823 is a deficient number, since it is larger than the sum of its proper divisors (36016833).

78725823 is a wasteful number, since it uses less digits than its factorization.

78725823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4854.

The product of its digits is 188160, while the sum is 42.

The square root of 78725823 is about 8872.7573504520. The cubic root of 78725823 is about 428.5870750319.

It can be divided in two parts, 7872 and 5823, that added together give a triangular number (13695 = T₁₆₅).

The spelling of 78725823 in words is "seventy-eight million, seven hundred twenty-five thousand, eight hundred twenty-three".