285681396 has 192 divisors, whose sum is σ = 948326400. Its totient is φ = 64419840.

The previous prime is 285681391. The next prime is 285681419. The reversal of 285681396 is 693186582.

It is a happy number.

It is a super-2 number, since 2×285681396² = 163227720041017632, which contains 22 as substring.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285681391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 203505 + ... + 204903.

It is an arithmetic number, because the mean of its divisors is an integer number (4939200).

Almost surely, 2^285681396 is an apocalyptic number.

285681396 is a gapful number since it is divisible by the number (26) 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 285681396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (474163200).

285681396 is an abundant number, since it is smaller than the sum of its proper divisors (662645004).

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

285681396 is a wasteful number, since it uses less digits than its factorization.

285681396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1454 (or 1452 counting only the distinct ones).

The product of its digits is 622080, while the sum is 48.

The square root of 285681396 is about 16902.1121757016. The cubic root of 285681396 is about 658.6084823831.

The spelling of 285681396 in words is "two hundred eighty-five million, six hundred eighty-one thousand, three hundred ninety-six".