286628920 has 32 divisors (see below), whose sum is σ = 646042320. Its totient is φ = 114451200.

The previous prime is 286628897. The next prime is 286628939. The reversal of 286628920 is 29826682.

It is a happy number.

It is a super-2 number, since 2×286628920² = 164312275560732800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18079 + ... + 30001.

Almost surely, 2^286628920 is an apocalyptic number.

286628920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

286628920 is an abundant number, since it is smaller than the sum of its proper divisors (359413400).

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

286628920 is a wasteful number, since it uses less digits than its factorization.

286628920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12535 (or 12531 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 286628920 is about 16930.1187237420. The cubic root of 286628920 is about 659.3358179064.

The spelling of 286628920 in words is "two hundred eighty-six million, six hundred twenty-eight thousand, nine hundred twenty".