285425640 has 64 divisors (see below), whose sum is σ = 951422400. Its totient is φ = 76113216.

The previous prime is 285425633. The next prime is 285425671. The reversal of 285425640 is 46524582.

It is a happy number.

285425640 is a `hidden beast` number, since 2 + 8 + 5 + 4 + 2 + 5 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 285425595 and 285425604.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131062 + ... + 133221.

It is an arithmetic number, because the mean of its divisors is an integer number (14865975).

Almost surely, 2^285425640 is an apocalyptic number.

285425640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

285425640 is an abundant number, since it is smaller than the sum of its proper divisors (665996760).

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

285425640 is a wasteful number, since it uses less digits than its factorization.

285425640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264303 (or 264293 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 36.

The square root of 285425640 is about 16894.5446816421. The cubic root of 285425640 is about 658.4118841627.

The spelling of 285425640 in words is "two hundred eighty-five million, four hundred twenty-five thousand, six hundred forty".