685020550 has 24 divisors (see below), whose sum is σ = 1283451336. Its totient is φ = 272005440.

The previous prime is 685020533. The next prime is 685020599. The reversal of 685020550 is 55020586.

685020550 is a modest number, since divided by 20550 gives 6850 as remainder.

It is a congruent 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 11 ways as a sum of consecutive naturals, for example, 43152 + ... + 56851.

It is an arithmetic number, because the mean of its divisors is an integer number (53477139).

Almost surely, 2^685020550 is an apocalyptic number.

685020550 is a deficient number, since it is larger than the sum of its proper divisors (598430786).

685020550 is a wasteful number, since it uses less digits than its factorization.

685020550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100152 (or 100147 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 685020550 is about 26172.8972412303. The cubic root of 685020550 is about 881.5247970210.

The spelling of 685020550 in words is "six hundred eighty-five million, twenty thousand, five hundred fifty".