690807385 has 4 divisors (see below), whose sum is σ = 828968868. Its totient is φ = 552645904.

The previous prime is 690807349. The next prime is 690807431. The reversal of 690807385 is 583708096.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 518882841 + 171924544 = 22779^2 + 13112^2 .

It is a cyclic number.

It is not a de Polignac number, because 690807385 - 2¹⁷ = 690676313 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69080734 + ... + 69080743.

It is an arithmetic number, because the mean of its divisors is an integer number (207242217).

Almost surely, 2^690807385 is an apocalyptic number.

It is an amenable number.

690807385 is a deficient number, since it is larger than the sum of its proper divisors (138161483).

690807385 is a wasteful number, since it uses less digits than its factorization.

690807385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138161482.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 690807385 is about 26283.2148908766. The cubic root of 690807385 is about 884.0001198617. Note that the first 3 decimals are identical.

The spelling of 690807385 in words is "six hundred ninety million, eight hundred seven thousand, three hundred eighty-five".