285632021 has 4 divisors (see below), whose sum is σ = 288159852. Its totient is φ = 283104192.

The previous prime is 285631961. The next prime is 285632023. The reversal of 285632021 is 120236582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120236582 = 2 ⋅60118291.

It can be written as a sum of positive squares in 2 ways, for example, as 141871921 + 143760100 = 11911^2 + 11990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285632021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285632023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1263746 + ... + 1263971.

It is an arithmetic number, because the mean of its divisors is an integer number (72039963).

Almost surely, 2^285632021 is an apocalyptic number.

It is an amenable number.

285632021 is a deficient number, since it is larger than the sum of its proper divisors (2527831).

285632021 is a wasteful number, since it uses less digits than its factorization.

285632021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2527830.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 285632021 is about 16900.6514963181. The cubic root of 285632021 is about 658.5705372365.

The spelling of 285632021 in words is "two hundred eighty-five million, six hundred thirty-two thousand, twenty-one".