285221376 has 240 divisors, whose sum is σ = 953697888. Its totient is φ = 81100800.

The previous prime is 285221371. The next prime is 285221381. The reversal of 285221376 is 673122582.

285221376 is a `hidden beast` number, since 285 + 2 + 2 + 1 + 376 = 666.

It is an interprime number because it is at equal distance from previous prime (285221371) and next prime (285221381).

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

It is a zygodrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 285221376.

It is not an unprimeable number, because it can be changed into a prime (285221371) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 861531 + ... + 861861.

Almost surely, 2^285221376 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 285221376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (476848944).

285221376 is an abundant number, since it is smaller than the sum of its proper divisors (668476512).

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

285221376 is a wasteful number, since it uses less digits than its factorization.

285221376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383 (or 364 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 285221376 is about 16888.4983346655. The cubic root of 285221376 is about 658.2547831862.

The spelling of 285221376 in words is "two hundred eighty-five million, two hundred twenty-one thousand, three hundred seventy-six".