205758440490 has 64 divisors (see below), whose sum is σ = 496948193280. Its totient is φ = 54521597760.

The previous prime is 205758440479. The next prime is 205758440491. The reversal of 205758440490 is 94044857502.

It is not an unprimeable number, because it can be changed into a prime (205758440491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20490891 + ... + 20500929.

It is an arithmetic number, because the mean of its divisors is an integer number (7764815520).

Almost surely, 2^205758440490 is an apocalyptic number.

205758440490 is an abundant number, since it is smaller than the sum of its proper divisors (291189752790).

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

205758440490 is a wasteful number, since it uses less digits than its factorization.

205758440490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14307.

The product of its (nonzero) digits is 1612800, while the sum is 48.

The spelling of 205758440490 in words is "two hundred five billion, seven hundred fifty-eight million, four hundred forty thousand, four hundred ninety".