685610590 has 32 divisors (see below), whose sum is σ = 1412766720. Its totient is φ = 234671904.

The previous prime is 685610587. The next prime is 685610593. The reversal of 685610590 is 95016586.

It is an interprime number because it is at equal distance from previous prime (685610587) and next prime (685610593).

It is a super-2 number, since 2×685610590² = 940123762240296200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685610593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35419 + ... + 51241.

It is an arithmetic number, because the mean of its divisors is an integer number (44148960).

Almost surely, 2^685610590 is an apocalyptic number.

685610590 is an abundant number, since it is smaller than the sum of its proper divisors (727156130).

685610590 is a wasteful number, since it uses less digits than its factorization.

685610590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16456.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 685610590 is about 26184.1667807093. The cubic root of 685610590 is about 881.7778237970. Note that the first 3 decimals are identical.

The spelling of 685610590 in words is "six hundred eighty-five million, six hundred ten thousand, five hundred ninety".