77690257 has 2 divisors, whose sum is σ = 77690258. Its totient is φ = 77690256.

The previous prime is 77690231. The next prime is 77690267. The reversal of 77690257 is 75209677.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44408896 + 33281361 = 6664^2 + 5769^2 .

It is a cyclic number.

It is not a de Polignac number, because 77690257 - 2¹¹ = 77688209 is a prime.

It is not a weakly prime, because it can be changed into another prime (77690227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38845128 + 38845129.

It is an arithmetic number, because the mean of its divisors is an integer number (38845129).

Almost surely, 2^77690257 is an apocalyptic number.

It is an amenable number.

77690257 is a deficient number, since it is larger than the sum of its proper divisors (1).

77690257 is an equidigital number, since it uses as much as digits as its factorization.

77690257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 185220, while the sum is 43.

The square root of 77690257 is about 8814.2076785154. The cubic root of 77690257 is about 426.6995511628.

The spelling of 77690257 in words is "seventy-seven million, six hundred ninety thousand, two hundred fifty-seven".