78657233 has 2 divisors, whose sum is σ = 78657234. Its totient is φ = 78657232.

The previous prime is 78657209. The next prime is 78657287. The reversal of 78657233 is 33275687.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48539089 + 30118144 = 6967^2 + 5488^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78657233 is a prime.

It is not a weakly prime, because it can be changed into another prime (78657133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39328616 + 39328617.

It is an arithmetic number, because the mean of its divisors is an integer number (39328617).

Almost surely, 2^78657233 is an apocalyptic number.

It is an amenable number.

78657233 is a deficient number, since it is larger than the sum of its proper divisors (1).

78657233 is an equidigital number, since it uses as much as digits as its factorization.

78657233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680, while the sum is 41.

The square root of 78657233 is about 8868.8913061329. The cubic root of 78657233 is about 428.4625698068.

The spelling of 78657233 in words is "seventy-eight million, six hundred fifty-seven thousand, two hundred thirty-three".