677642989 has 2 divisors, whose sum is σ = 677642990. Its totient is φ = 677642988.

The previous prime is 677642969. The next prime is 677642993. The reversal of 677642989 is 989246776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 544055625 + 133587364 = 23325^2 + 11558^2 .

It is a cyclic number.

It is not a de Polignac number, because 677642989 - 2²¹ = 675545837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (677642939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 338821494 + 338821495.

It is an arithmetic number, because the mean of its divisors is an integer number (338821495).

Almost surely, 2^677642989 is an apocalyptic number.

It is an amenable number.

677642989 is a deficient number, since it is larger than the sum of its proper divisors (1).

677642989 is an equidigital number, since it uses as much as digits as its factorization.

677642989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9144576, while the sum is 58.

The square root of 677642989 is about 26031.5767674569. The cubic root of 677642989 is about 878.3487410167.

The spelling of 677642989 in words is "six hundred seventy-seven million, six hundred forty-two thousand, nine hundred eighty-nine".