285939475920 has 640 divisors, whose sum is σ = 1147499412480. Its totient is φ = 64099123200.

The previous prime is 285939475897. The next prime is 285939475933. The reversal of 285939475920 is 29574939582.

285939475920 is a `hidden beast` number, since 2 + 8 + 5 + 9 + 39 + 4 + 7 + 592 + 0 = 666.

It is a super-2 number, since 2×285939475920² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 172563732 + ... + 172565388.

It is an arithmetic number, because the mean of its divisors is an integer number (1792967832).

Almost surely, 2^285939475920 is an apocalyptic number.

285939475920 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 285939475920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (573749706240).

285939475920 is an abundant number, since it is smaller than the sum of its proper divisors (861559936560).

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

285939475920 is a wasteful number, since it uses less digits than its factorization.

285939475920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1900 (or 1888 counting only the distinct ones).

The product of its (nonzero) digits is 48988800, while the sum is 63.

The spelling of 285939475920 in words is "two hundred eighty-five billion, nine hundred thirty-nine million, four hundred seventy-five thousand, nine hundred twenty".