725621811 has 8 divisors (see below), whose sum is σ = 969146304. Its totient is φ = 482922600.

The previous prime is 725621803. The next prime is 725621843. The reversal of 725621811 is 118126527.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 725621811 - 2³ = 725621803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (725621011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204265 + ... + 207786.

It is an arithmetic number, because the mean of its divisors is an integer number (121143288).

Almost surely, 2^725621811 is an apocalyptic number.

725621811 is a deficient number, since it is larger than the sum of its proper divisors (243524493).

725621811 is a wasteful number, since it uses less digits than its factorization.

725621811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412641.

The product of its digits is 6720, while the sum is 33.

The square root of 725621811 is about 26937.3683013022. The cubic root of 725621811 is about 898.6076458205.

The spelling of 725621811 in words is "seven hundred twenty-five million, six hundred twenty-one thousand, eight hundred eleven".