721475036 has 48 divisors (see below), whose sum is σ = 1358622720. Its totient is φ = 334037760.

The previous prime is 721475023. The next prime is 721475057. The reversal of 721475036 is 630574127.

It is a junction number, because it is equal to n+sod(n) for n = 721474987 and 721475005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1673741 + ... + 1674171.

It is an arithmetic number, because the mean of its divisors is an integer number (28304640).

Almost surely, 2^721475036 is an apocalyptic number.

It is an amenable number.

721475036 is a deficient number, since it is larger than the sum of its proper divisors (637147684).

721475036 is a wasteful number, since it uses less digits than its factorization.

721475036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794 (or 792 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 721475036 is about 26860.2873402352. The cubic root of 721475036 is about 896.8925904614.

Subtracting from 721475036 its reverse (630574127), we obtain a palindrome (90900909).

The spelling of 721475036 in words is "seven hundred twenty-one million, four hundred seventy-five thousand, thirty-six".