685020554 has 8 divisors (see below), whose sum is σ = 1029265380. Its totient is φ = 341932096.

The previous prime is 685020533. The next prime is 685020599. The reversal of 685020554 is 455020586.

It can be written as a sum of positive squares in 2 ways, for example, as 591608329 + 93412225 = 24323^2 + 9665^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 287609 + ... + 289980.

Almost surely, 2^685020554 is an apocalyptic number.

685020554 is a deficient number, since it is larger than the sum of its proper divisors (344244826).

685020554 is a wasteful number, since it uses less digits than its factorization.

685020554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578184.

The product of its (nonzero) digits is 48000, while the sum is 35.

The square root of 685020554 is about 26172.8973176452. The cubic root of 685020554 is about 881.5247987368.

The spelling of 685020554 in words is "six hundred eighty-five million, twenty thousand, five hundred fifty-four".