690878465 has 8 divisors (see below), whose sum is σ = 830787840. Its totient is φ = 551546992.

The previous prime is 690878459. The next prime is 690878477. The reversal of 690878465 is 564878096.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 690878465 - 2⁶ = 690878401 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 141839 + ... + 146628.

It is an arithmetic number, because the mean of its divisors is an integer number (103848480).

Almost surely, 2^690878465 is an apocalyptic number.

It is an amenable number.

690878465 is a deficient number, since it is larger than the sum of its proper divisors (139909375).

690878465 is a wasteful number, since it uses less digits than its factorization.

690878465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288951.

The product of its (nonzero) digits is 2903040, while the sum is 53.

The square root of 690878465 is about 26284.5670498869. The cubic root of 690878465 is about 884.0304382857.

The spelling of 690878465 in words is "six hundred ninety million, eight hundred seventy-eight thousand, four hundred sixty-five".