78032569 has 2 divisors, whose sum is σ = 78032570. Its totient is φ = 78032568.

The previous prime is 78032543. The next prime is 78032609. The reversal of 78032569 is 96523087.

It is an a-pointer prime, because the next prime (78032609) can be obtained adding 78032569 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67043344 + 10989225 = 8188^2 + 3315^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78032569 is a prime.

It is a super-2 number, since 2×78032569² = 12178163649479522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78032509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39016284 + 39016285.

It is an arithmetic number, because the mean of its divisors is an integer number (39016285).

Almost surely, 2^78032569 is an apocalyptic number.

It is an amenable number.

78032569 is a deficient number, since it is larger than the sum of its proper divisors (1).

78032569 is an equidigital number, since it uses as much as digits as its factorization.

78032569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 78032569 is about 8833.6045304281. The cubic root of 78032569 is about 427.3253283650.

The spelling of 78032569 in words is "seventy-eight million, thirty-two thousand, five hundred sixty-nine".