721502748428 has 48 divisors (see below), whose sum is σ = 1575661113600. Its totient is φ = 280841878080.

The previous prime is 721502748391. The next prime is 721502748467. The reversal of 721502748428 is 824847205127.

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, 766418 + ... + 1424921.

It is an arithmetic number, because the mean of its divisors is an integer number (32826273200).

Almost surely, 2^721502748428 is an apocalyptic number.

It is an amenable number.

721502748428 is an abundant number, since it is smaller than the sum of its proper divisors (854158365172).

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

721502748428 is a wasteful number, since it uses less digits than its factorization.

721502748428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2192430 (or 2192428 counting only the distinct ones).

The product of its (nonzero) digits is 2007040, while the sum is 50.

The spelling of 721502748428 in words is "seven hundred twenty-one billion, five hundred two million, seven hundred forty-eight thousand, four hundred twenty-eight".