690807945 has 16 divisors (see below), whose sum is σ = 1135166400. Its totient is φ = 358473024.

The previous prime is 690807917. The next prime is 690807959. The reversal of 690807945 is 549708096.

It is not a de Polignac number, because 690807945 - 2¹⁷ = 690676873 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 690807894 and 690807903.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 621795 + ... + 622904.

It is an arithmetic number, because the mean of its divisors is an integer number (70947900).

Almost surely, 2^690807945 is an apocalyptic number.

It is an amenable number.

690807945 is a deficient number, since it is larger than the sum of its proper divisors (444358455).

690807945 is a wasteful number, since it uses less digits than its factorization.

690807945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244744.

The product of its (nonzero) digits is 544320, while the sum is 48.

The square root of 690807945 is about 26283.2255440614. The cubic root of 690807945 is about 884.0003587319. Note that the first 3 decimals are identical.

The spelling of 690807945 in words is "six hundred ninety million, eight hundred seven thousand, nine hundred forty-five".