78572869 has 2 divisors, whose sum is σ = 78572870. Its totient is φ = 78572868.

The previous prime is 78572831. The next prime is 78572873. The reversal of 78572869 is 96827587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47100769 + 31472100 = 6863^2 + 5610^2 .

It is an emirp because it is prime and its reverse (96827587) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78572869 - 2²⁵ = 45018437 is a prime.

It is a super-2 number, since 2×78572869² = 12347391485782322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78572069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39286434 + 39286435.

It is an arithmetic number, because the mean of its divisors is an integer number (39286435).

Almost surely, 2^78572869 is an apocalyptic number.

It is an amenable number.

78572869 is a deficient number, since it is larger than the sum of its proper divisors (1).

78572869 is an equidigital number, since it uses as much as digits as its factorization.

78572869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1693440, while the sum is 52.

The square root of 78572869 is about 8864.1338550363. The cubic root of 78572869 is about 428.3093321634.

The spelling of 78572869 in words is "seventy-eight million, five hundred seventy-two thousand, eight hundred sixty-nine".