685584621 has 32 divisors (see below), whose sum is σ = 1096416000. Its totient is φ = 422097984.

The previous prime is 685584593. The next prime is 685584649. The reversal of 685584621 is 126485586.

685584621 is a `hidden beast` number, since 6 + 8 + 5 + 584 + 62 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (685584593) and next prime (685584649).

It is not a de Polignac number, because 685584621 - 2⁵ = 685584589 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685582621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1026 + ... + 37043.

It is an arithmetic number, because the mean of its divisors is an integer number (34263000).

Almost surely, 2^685584621 is an apocalyptic number.

It is an amenable number.

685584621 is a deficient number, since it is larger than the sum of its proper divisors (410831379).

685584621 is a wasteful number, since it uses less digits than its factorization.

685584621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38130 (or 38124 counting only the distinct ones).

The product of its digits is 460800, while the sum is 45.

The square root of 685584621 is about 26183.6708847327. The cubic root of 685584621 is about 881.7666905688.

The spelling of 685584621 in words is "six hundred eighty-five million, five hundred eighty-four thousand, six hundred twenty-one".