810886640 has 20 divisors (see below), whose sum is σ = 1885311624. Its totient is φ = 324354624.

The previous prime is 810886639. The next prime is 810886679. The reversal of 810886640 is 46688018.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5067962 + ... + 5068121.

Almost surely, 2^810886640 is an apocalyptic number.

810886640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

810886640 is an abundant number, since it is smaller than the sum of its proper divisors (1074424984).

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

810886640 is a wasteful number, since it uses less digits than its factorization.

810886640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10136096 (or 10136090 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 41.

The square root of 810886640 is about 28476.0713582474. The cubic root of 810886640 is about 932.5097508007.

The spelling of 810886640 in words is "eight hundred ten million, eight hundred eighty-six thousand, six hundred forty".