685623520 has 24 divisors (see below), whose sum is σ = 1619785944. Its totient is φ = 274249344.

The previous prime is 685623511. The next prime is 685623563. The reversal of 685623520 is 25326586.

It is a happy number.

It is a super-2 number, since 2×685623520² = 940159222354380800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 685623520.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2142414 + ... + 2142733.

It is an arithmetic number, because the mean of its divisors is an integer number (67491081).

Almost surely, 2^685623520 is an apocalyptic number.

It is an amenable number.

685623520 is an abundant number, since it is smaller than the sum of its proper divisors (934162424).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

685623520 is a wasteful number, since it uses less digits than its factorization.

685623520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4285162 (or 4285154 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 685623520 is about 26184.4136844803. The cubic root of 685623520 is about 881.7833669415.

The spelling of 685623520 in words is "six hundred eighty-five million, six hundred twenty-three thousand, five hundred twenty".