285687640 has 48 divisors (see below), whose sum is σ = 747748800. Its totient is φ = 97949376.

The previous prime is 285687587. The next prime is 285687641. The reversal of 285687640 is 46786582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285687641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70920 + ... + 74839.

It is an arithmetic number, because the mean of its divisors is an integer number (15578100).

Almost surely, 2^285687640 is an apocalyptic number.

285687640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

285687640 is an abundant number, since it is smaller than the sum of its proper divisors (462061160).

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

285687640 is a wasteful number, since it uses less digits than its factorization.

285687640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145784 (or 145773 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 46.

The square root of 285687640 is about 16902.2968853348. The cubic root of 285687640 is about 658.6132806438.

The spelling of 285687640 in words is "two hundred eighty-five million, six hundred eighty-seven thousand, six hundred forty".