495991890 has 32 divisors (see below), whose sum is σ = 1322645760. Its totient is φ = 132264432.

The previous prime is 495991877. The next prime is 495991897. The reversal of 495991890 is 98199594.

495991890 is a `hidden beast` number, since 49 + 599 + 1 + 8 + 9 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (495991897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 918234 + ... + 918773.

It is an arithmetic number, because the mean of its divisors is an integer number (41332680).

Almost surely, 2^495991890 is an apocalyptic number.

495991890 is an abundant number, since it is smaller than the sum of its proper divisors (826653870).

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

495991890 is a wasteful number, since it uses less digits than its factorization.

495991890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1837023 (or 1837017 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 54.

The square root of 495991890 is about 22270.8753757009. The cubic root of 495991890 is about 791.5740075979.

The spelling of 495991890 in words is "four hundred ninety-five million, nine hundred ninety-one thousand, eight hundred ninety".