810890725 has 12 divisors (see below), whose sum is σ = 1024477956. Its totient is φ = 636471680.

The previous prime is 810890677. The next prime is 810890747. The reversal of 810890725 is 527098018.

810890725 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 20493729 + 790396996 = 4527^2 + 28114^2 .

It is a de Polignac number, because none of the positive numbers 2^k-810890725 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 304672 + ... + 307321.

It is an arithmetic number, because the mean of its divisors is an integer number (85373163).

Almost surely, 2^810890725 is an apocalyptic number.

It is an amenable number.

810890725 is a deficient number, since it is larger than the sum of its proper divisors (213587231).

810890725 is a wasteful number, since it uses less digits than its factorization.

810890725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612056 (or 612051 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 810890725 is about 28476.1430850458. The cubic root of 810890725 is about 932.5113166981.

The spelling of 810890725 in words is "eight hundred ten million, eight hundred ninety thousand, seven hundred twenty-five".