77890257 has 12 divisors (see below), whose sum is σ = 112686964. Its totient is φ = 51844320.

The previous prime is 77890249. The next prime is 77890289. The reversal of 77890257 is 75209877.

It can be written as a sum of positive squares in 2 ways, for example, as 66438801 + 11451456 = 8151^2 + 3384^2 .

It is not a de Polignac number, because 77890257 - 2³ = 77890249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77890357) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 598 + ... + 12495.

Almost surely, 2^77890257 is an apocalyptic number.

It is an amenable number.

77890257 is a deficient number, since it is larger than the sum of its proper divisors (34796707).

77890257 is a wasteful number, since it uses less digits than its factorization.

77890257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13760 (or 13757 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 45.

The square root of 77890257 is about 8825.5457055074. The cubic root of 77890257 is about 427.0653919052.

The spelling of 77890257 in words is "seventy-seven million, eight hundred ninety thousand, two hundred fifty-seven".