810728725 has 24 divisors (see below), whose sum is σ = 1110732480. Its totient is φ = 583883520.

The previous prime is 810728713. The next prime is 810728741. The reversal of 810728725 is 527827018.

It is not a de Polignac number, because 810728725 - 2⁵ = 810728693 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31695 + ... + 51244.

It is an arithmetic number, because the mean of its divisors is an integer number (46280520).

Almost surely, 2^810728725 is an apocalyptic number.

810728725 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

810728725 is a deficient number, since it is larger than the sum of its proper divisors (300003755).

810728725 is a wasteful number, since it uses less digits than its factorization.

810728725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82989 (or 82984 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 40.

The square root of 810728725 is about 28473.2984566242. The cubic root of 810728725 is about 932.4492134291.

The spelling of 810728725 in words is "eight hundred ten million, seven hundred twenty-eight thousand, seven hundred twenty-five".