721425873 has 24 divisors (see below), whose sum is σ = 1146247200. Its totient is φ = 402185280.

The previous prime is 721425869. The next prime is 721425941. The reversal of 721425873 is 378524127.

It is not a de Polignac number, because 721425873 - 2² = 721425869 is a prime.

It is not an unprimeable number, because it can be changed into a prime (721425823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53823 + ... + 65876.

It is an arithmetic number, because the mean of its divisors is an integer number (47760300).

Almost surely, 2^721425873 is an apocalyptic number.

It is an amenable number.

721425873 is a deficient number, since it is larger than the sum of its proper divisors (424821327).

721425873 is a wasteful number, since it uses less digits than its factorization.

721425873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119757 (or 119750 counting only the distinct ones).

The product of its digits is 94080, while the sum is 39.

The square root of 721425873 is about 26859.3721631761. The cubic root of 721425873 is about 896.8722178775.

The spelling of 721425873 in words is "seven hundred twenty-one million, four hundred twenty-five thousand, eight hundred seventy-three".