285400428 has 24 divisors (see below), whose sum is σ = 666402240. Its totient is φ = 95066640.

The previous prime is 285400421. The next prime is 285400439. The reversal of 285400428 is 824004582.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (285400421) 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 7 ways as a sum of consecutive naturals, for example, 11283 + ... + 26421.

It is an arithmetic number, because the mean of its divisors is an integer number (27766760).

Almost surely, 2^285400428 is an apocalyptic number.

It is an amenable number.

285400428 is an abundant number, since it is smaller than the sum of its proper divisors (381001812).

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

285400428 is a wasteful number, since it uses less digits than its factorization.

285400428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16717 (or 16715 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 33.

The square root of 285400428 is about 16893.7985071446. The cubic root of 285400428 is about 658.3924974797.

The spelling of 285400428 in words is "two hundred eighty-five million, four hundred thousand, four hundred twenty-eight".