721444437228 has 48 divisors (see below), whose sum is σ = 1684878179040. Its totient is φ = 240266188800.

The previous prime is 721444437227. The next prime is 721444437253. The reversal of 721444437228 is 822734444127.

It is not an unprimeable number, because it can be changed into a prime (721444437227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81413518 + ... + 81422378.

It is an arithmetic number, because the mean of its divisors is an integer number (35101628730).

Almost surely, 2^721444437228 is an apocalyptic number.

It is an amenable number.

721444437228 is an abundant number, since it is smaller than the sum of its proper divisors (963433741812).

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

721444437228 is a wasteful number, since it uses less digits than its factorization.

721444437228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14178 (or 14176 counting only the distinct ones).

The product of its digits is 2408448, while the sum is 48.

The spelling of 721444437228 in words is "seven hundred twenty-one billion, four hundred forty-four million, four hundred thirty-seven thousand, two hundred twenty-eight".