690172865 has 8 divisors (see below), whose sum is σ = 828348648. Its totient is φ = 552044160.

The previous prime is 690172859. The next prime is 690172883. The reversal of 690172865 is 568271096.

It can be written as a sum of positive squares in 4 ways, for example, as 47499664 + 642673201 = 6892^2 + 25351^2 .

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

It is not a de Polignac number, because 690172865 - 2¹⁸ = 689910721 is a prime.

It is a Duffinian number.

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, 49355 + ... + 61775.

It is an arithmetic number, because the mean of its divisors is an integer number (103543581).

Almost surely, 2^690172865 is an apocalyptic number.

It is an amenable number.

690172865 is a deficient number, since it is larger than the sum of its proper divisors (138175783).

690172865 is a wasteful number, since it uses less digits than its factorization.

690172865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23539.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 690172865 is about 26271.1412961066. The cubic root of 690172865 is about 883.7293798584.

The spelling of 690172865 in words is "six hundred ninety million, one hundred seventy-two thousand, eight hundred sixty-five".