685503621 has 32 divisors (see below), whose sum is σ = 1109712000. Its totient is φ = 414771840.

The previous prime is 685503613. The next prime is 685503629. The reversal of 685503621 is 126305586.

It is an interprime number because it is at equal distance from previous prime (685503613) and next prime (685503629).

It is not a de Polignac number, because 685503621 - 2³ = 685503613 is a prime.

It is a super-2 number, since 2×685503621² = 939830428808223282, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685503629) 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, 223305 + ... + 226353.

It is an arithmetic number, because the mean of its divisors is an integer number (34678500).

Almost surely, 2^685503621 is an apocalyptic number.

It is an amenable number.

685503621 is a deficient number, since it is larger than the sum of its proper divisors (424208379).

685503621 is a wasteful number, since it uses less digits than its factorization.

685503621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3826 (or 3820 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 685503621 is about 26182.1240734972. The cubic root of 685503621 is about 881.7319630712.

The spelling of 685503621 in words is "six hundred eighty-five million, five hundred three thousand, six hundred twenty-one".