78225569 has 2 divisors, whose sum is σ = 78225570. Its totient is φ = 78225568.

The previous prime is 78225547. The next prime is 78225601. The reversal of 78225569 is 96552287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71910400 + 6315169 = 8480^2 + 2513^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78225569 is a prime.

It is a super-2 number, since 2×78225569² = 12238479290747522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78224569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39112784 + 39112785.

It is an arithmetic number, because the mean of its divisors is an integer number (39112785).

Almost surely, 2^78225569 is an apocalyptic number.

It is an amenable number.

78225569 is a deficient number, since it is larger than the sum of its proper divisors (1).

78225569 is an equidigital number, since it uses as much as digits as its factorization.

78225569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 302400, while the sum is 44.

The square root of 78225569 is about 8844.5219769075. The cubic root of 78225569 is about 427.6773432901.

The spelling of 78225569 in words is "seventy-eight million, two hundred twenty-five thousand, five hundred sixty-nine".