285339690 has 48 divisors (see below), whose sum is σ = 748475208. Its totient is φ = 75414528.

The previous prime is 285339661. The next prime is 285339697. The reversal of 285339690 is 96933582.

285339690 is a `hidden beast` number, since 28 + 533 + 9 + 6 + 90 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 147112641 + 138227049 = 12129^2 + 11757^2 .

It is a super-2 number, since 2×285339690² = 162837477378592200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (285339697) 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, 3859 + ... + 24198.

Almost surely, 2^285339690 is an apocalyptic number.

285339690 is an abundant number, since it is smaller than the sum of its proper divisors (463135518).

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

285339690 is a wasteful number, since it uses less digits than its factorization.

285339690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28183 (or 28180 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The square root of 285339690 is about 16892.0007695951. Note that the first 3 decimals coincide. The cubic root of 285339690 is about 658.3457885090.

The spelling of 285339690 in words is "two hundred eighty-five million, three hundred thirty-nine thousand, six hundred ninety".