685283400 has 72 divisors (see below), whose sum is σ = 2301416130. Its totient is φ = 182741760.

The previous prime is 685283399. The next prime is 685283419. The reversal of 685283400 is 4382586.

It can be written as a sum of positive squares in 3 ways, for example, as 555733476 + 129549924 = 23574^2 + 11382^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×685283400² = 939226676631120000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 188557 + ... + 192156.

Almost surely, 2^685283400 is an apocalyptic number.

685283400 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

685283400 is an abundant number, since it is smaller than the sum of its proper divisors (1616132730).

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

685283400 is a wasteful number, since it uses less digits than its factorization.

685283400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380735 (or 380723 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 685283400 is about 26177.9181754394. The cubic root of 685283400 is about 881.6375328909.

The spelling of 685283400 in words is "six hundred eighty-five million, two hundred eighty-three thousand, four hundred".