1685020800 has 96 divisors (see below), whose sum is σ = 5550068880. Its totient is φ = 449336320.

The previous prime is 1685020793. The next prime is 1685020801. The reversal of 1685020800 is 80205861.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (1685020801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78162 + ... + 97361.

Almost surely, 2^1685020800 is an apocalyptic number.

1685020800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1685020800 is an abundant number, since it is smaller than the sum of its proper divisors (3865048080).

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

1685020800 is a wasteful number, since it uses less digits than its factorization.

1685020800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175550 (or 175533 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 1685020800 is about 41049.0048600450. The cubic root of 1685020800 is about 1189.9674684514.

The spelling of 1685020800 in words is "one billion, six hundred eighty-five million, twenty thousand, eight hundred".