721028925 has 24 divisors (see below), whose sum is σ = 1324558080. Its totient is φ = 384548400.

The previous prime is 721028923. The next prime is 721028933. The reversal of 721028925 is 529820127.

It is not a de Polignac number, because 721028925 - 2¹ = 721028923 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 721028925.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721028923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 533421 + ... + 534770.

It is an arithmetic number, because the mean of its divisors is an integer number (55189920).

Almost surely, 2^721028925 is an apocalyptic number.

721028925 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

721028925 is a deficient number, since it is larger than the sum of its proper divisors (603529155).

721028925 is a wasteful number, since it uses less digits than its factorization.

721028925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1068210 (or 1068199 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 721028925 is about 26851.9817704392. The cubic root of 721028925 is about 896.7076932594.

The spelling of 721028925 in words is "seven hundred twenty-one million, twenty-eight thousand, nine hundred twenty-five".