285213720 has 64 divisors (see below), whose sum is σ = 933431040. Its totient is φ = 69142400.

The previous prime is 285213713. The next prime is 285213727. The reversal of 285213720 is 27312582.

It is an interprime number because it is at equal distance from previous prime (285213713) and next prime (285213727).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285213727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106716 + ... + 109355.

It is an arithmetic number, because the mean of its divisors is an integer number (14584860).

Almost surely, 2^285213720 is an apocalyptic number.

285213720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

285213720 is an abundant number, since it is smaller than the sum of its proper divisors (648217320).

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

285213720 is a wasteful number, since it uses less digits than its factorization.

285213720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216096 (or 216092 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 285213720 is about 16888.2716700082. The cubic root of 285213720 is about 658.2488934410.

The spelling of 285213720 in words is "two hundred eighty-five million, two hundred thirteen thousand, seven hundred twenty".