721226044 has 24 divisors (see below), whose sum is σ = 1573584768. Its totient is φ = 280997040.

The previous prime is 721226041. The next prime is 721226069. The reversal of 721226044 is 440622127.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721226041) 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, 1170514 + ... + 1171129.

It is an arithmetic number, because the mean of its divisors is an integer number (65566032).

Almost surely, 2^721226044 is an apocalyptic number.

It is an amenable number.

721226044 is an abundant number, since it is smaller than the sum of its proper divisors (852358724).

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

721226044 is a wasteful number, since it uses less digits than its factorization.

721226044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2341665 (or 2341663 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 721226044 is about 26855.6519935748. The cubic root of 721226044 is about 896.7894015018.

The spelling of 721226044 in words is "seven hundred twenty-one million, two hundred twenty-six thousand, forty-four".