677787949 has 2 divisors, whose sum is σ = 677787950. Its totient is φ = 677787948.

The previous prime is 677787947. The next prime is 677787959. The reversal of 677787949 is 949787776.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 417998025 + 259789924 = 20445^2 + 16118^2 .

It is a cyclic number.

It is not a de Polignac number, because 677787949 - 2¹ = 677787947 is a prime.

Together with 677787947, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (677787947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 338893974 + 338893975.

It is an arithmetic number, because the mean of its divisors is an integer number (338893975).

Almost surely, 2^677787949 is an apocalyptic number.

It is an amenable number.

677787949 is a deficient number, since it is larger than the sum of its proper divisors (1).

677787949 is an equidigital number, since it uses as much as digits as its factorization.

677787949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37340352, while the sum is 64.

The square root of 677787949 is about 26034.3609293564. The cubic root of 677787949 is about 878.4113680723.

The spelling of 677787949 in words is "six hundred seventy-seven million, seven hundred eighty-seven thousand, nine hundred forty-nine".