283985640 has 48 divisors (see below), whose sum is σ = 922954500. Its totient is φ = 75729408.

The previous prime is 283985633. The next prime is 283985641. The reversal of 283985640 is 46589382.

283985640 is a `hidden beast` number, since 2 + 83 + 9 + 8 + 564 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 278022276 + 5963364 = 16674^2 + 2442^2 .

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 (283985641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 394065 + ... + 394784.

Almost surely, 2^283985640 is an apocalyptic number.

283985640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

283985640 is an abundant number, since it is smaller than the sum of its proper divisors (638968860).

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

283985640 is a wasteful number, since it uses less digits than its factorization.

283985640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788866 (or 788859 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 283985640 is about 16851.8734863516. The cubic root of 283985640 is about 657.3027662875.

The spelling of 283985640 in words is "two hundred eighty-three million, nine hundred eighty-five thousand, six hundred forty".