285388740 has 432 divisors, whose sum is σ = 1150269120. Its totient is φ = 56609280.

The previous prime is 285388717. The next prime is 285388751. The reversal of 285388740 is 47883582.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 2178475 + ... + 2178605.

It is an arithmetic number, because the mean of its divisors is an integer number (2662660).

Almost surely, 2^285388740 is an apocalyptic number.

285388740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 285388740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (575134560).

285388740 is an abundant number, since it is smaller than the sum of its proper divisors (864880380).

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

285388740 is a wasteful number, since it uses less digits than its factorization.

285388740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192 (or 180 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The square root of 285388740 is about 16893.4525778480. The cubic root of 285388740 is about 658.3835096439.

The spelling of 285388740 in words is "two hundred eighty-five million, three hundred eighty-eight thousand, seven hundred forty".