285920920 has 16 divisors (see below), whose sum is σ = 643322160. Its totient is φ = 114368352.

The previous prime is 285920897. The next prime is 285920923. The reversal of 285920920 is 29029582.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 285920920.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285920923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3573972 + ... + 3574051.

It is an arithmetic number, because the mean of its divisors is an integer number (40207635).

Almost surely, 2^285920920 is an apocalyptic number.

285920920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

285920920 is an abundant number, since it is smaller than the sum of its proper divisors (357401240).

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

285920920 is a wasteful number, since it uses less digits than its factorization.

285920920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7148034 (or 7148030 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 285920920 is about 16909.1963144320. The cubic root of 285920920 is about 658.7924967813.

The spelling of 285920920 in words is "two hundred eighty-five million, nine hundred twenty thousand, nine hundred twenty".