205991464 has 32 divisors (see below), whose sum is σ = 464644800. Its totient is φ = 83635200.

The previous prime is 205991453. The next prime is 205991477. The reversal of 205991464 is 464199502.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95737 + ... + 97864.

It is an arithmetic number, because the mean of its divisors is an integer number (14520150).

Almost surely, 2^205991464 is an apocalyptic number.

It is an amenable number.

205991464 is an abundant number, since it is smaller than the sum of its proper divisors (258653336).

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

205991464 is a wasteful number, since it uses less digits than its factorization.

205991464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193633 (or 193629 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 205991464 is about 14352.4027256763. The cubic root of 205991464 is about 590.5859007888.

The spelling of 205991464 in words is "two hundred five million, nine hundred ninety-one thousand, four hundred sixty-four".