285820780 has 48 divisors (see below), whose sum is σ = 697616640. Its totient is φ = 96331968.

The previous prime is 285820763. The next prime is 285820783. The reversal of 285820780 is 87028582.

It is not an unprimeable number, because it can be changed into a prime (285820783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9042 + ... + 25561.

It is an arithmetic number, because the mean of its divisors is an integer number (14533680).

Almost surely, 2^285820780 is an apocalyptic number.

285820780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

285820780 is an abundant number, since it is smaller than the sum of its proper divisors (411795860).

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

285820780 is a wasteful number, since it uses less digits than its factorization.

285820780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34678 (or 34676 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 40.

The square root of 285820780 is about 16906.2349445404. The cubic root of 285820780 is about 658.7155766968.

The spelling of 285820780 in words is "two hundred eighty-five million, eight hundred twenty thousand, seven hundred eighty".