689197977 has 20 divisors (see below), whose sum is σ = 1108739940. Its totient is φ = 424121184.

The previous prime is 689197909. The next prime is 689197991. The reversal of 689197977 is 779791986.

It can be written as a sum of positive squares in 2 ways, for example, as 167029776 + 522168201 = 12924^2 + 22851^2 .

It is not a de Polignac number, because 689197977 - 2¹⁵ = 689165209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (689197997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 326202 + ... + 328307.

It is an arithmetic number, because the mean of its divisors is an integer number (55436997).

Almost surely, 2^689197977 is an apocalyptic number.

It is an amenable number.

689197977 is a deficient number, since it is larger than the sum of its proper divisors (419541963).

689197977 is a wasteful number, since it uses less digits than its factorization.

689197977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654534 (or 654525 counting only the distinct ones).

The product of its digits is 12002256, while the sum is 63.

The square root of 689197977 is about 26252.5803874591. The cubic root of 689197977 is about 883.3130865024.

The spelling of 689197977 in words is "six hundred eighty-nine million, one hundred ninety-seven thousand, nine hundred seventy-seven".