285140520 has 128 divisors (see below), whose sum is σ = 1086278400. Its totient is φ = 65173248.

The previous prime is 285140519. The next prime is 285140539. The reversal of 285140520 is 25041582.

It is a happy number.

It is a super-2 number, since 2×285140520² = 162610232291740800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11299 + ... + 26418.

It is an arithmetic number, because the mean of its divisors is an integer number (8486550).

Almost surely, 2^285140520 is an apocalyptic number.

285140520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

285140520 is an abundant number, since it is smaller than the sum of its proper divisors (801137880).

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

285140520 is a wasteful number, since it uses less digits than its factorization.

285140520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37744 (or 37734 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 285140520 is about 16886.1043464738. The cubic root of 285140520 is about 658.1925755078.

The spelling of 285140520 in words is "two hundred eighty-five million, one hundred forty thousand, five hundred twenty".