721100044 has 24 divisors (see below), whose sum is σ = 1442881440. Its totient is φ = 308896896.

The previous prime is 721100011. The next prime is 721100053. The reversal of 721100044 is 440001127.

It is a junction number, because it is equal to n+sod(n) for n = 721099994 and 721100030.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71694 + ... + 81130.

It is an arithmetic number, because the mean of its divisors is an integer number (60120060).

Almost surely, 2^721100044 is an apocalyptic number.

It is an amenable number.

721100044 is an abundant number, since it is smaller than the sum of its proper divisors (721781396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

721100044 is a wasteful number, since it uses less digits than its factorization.

721100044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12177 (or 12175 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 721100044 is about 26853.3060162059. The cubic root of 721100044 is about 896.7371746739.

The spelling of 721100044 in words is "seven hundred twenty-one million, one hundred thousand, forty-four".