690378689 has 72 divisors (see below), whose sum is σ = 974310120. Its totient is φ = 487206720.

The previous prime is 690378683. The next prime is 690378713. The reversal of 690378689 is 986873096.

It can be written as a sum of positive squares in 4 ways, for example, as 142444225 + 547934464 = 11935^2 + 23408^2 .

It is not a de Polignac number, because 690378689 - 2⁴ = 690378673 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690378683) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 13025987 + ... + 13026039.

It is an arithmetic number, because the mean of its divisors is an integer number (13532085).

Almost surely, 2^690378689 is an apocalyptic number.

It is an amenable number.

690378689 is a deficient number, since it is larger than the sum of its proper divisors (283931431).

690378689 is a wasteful number, since it uses less digits than its factorization.

690378689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 56.

The square root of 690378689 is about 26275.0583063102. The cubic root of 690378689 is about 883.8172199956.

The spelling of 690378689 in words is "six hundred ninety million, three hundred seventy-eight thousand, six hundred eighty-nine".