78572369 has 2 divisors, whose sum is σ = 78572370. Its totient is φ = 78572368.

The previous prime is 78572311. The next prime is 78572371. The reversal of 78572369 is 96327587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78552769 + 19600 = 8863^2 + 140^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78572369 is a prime.

It is a super-2 number, since 2×78572369² = 12347234340544322, which contains 22 as substring.

Together with 78572371, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78572399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39286184 + 39286185.

It is an arithmetic number, because the mean of its divisors is an integer number (39286185).

Almost surely, 2^78572369 is an apocalyptic number.

It is an amenable number.

78572369 is a deficient number, since it is larger than the sum of its proper divisors (1).

78572369 is an equidigital number, since it uses as much as digits as its factorization.

78572369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 635040, while the sum is 47.

The square root of 78572369 is about 8864.1056514462. The cubic root of 78572369 is about 428.3084236432.

The spelling of 78572369 in words is "seventy-eight million, five hundred seventy-two thousand, three hundred sixty-nine".