721090949776 has 20 divisors (see below), whose sum is σ = 1399446144000. Its totient is φ = 359943557792.

The previous prime is 721090949659. The next prime is 721090949779. The reversal of 721090949776 is 677949090127.

721090949776 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (721090949779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37609936 + ... + 37629103.

It is an arithmetic number, because the mean of its divisors is an integer number (69972307200).

Almost surely, 2^721090949776 is an apocalyptic number.

It is an amenable number.

721090949776 is a deficient number, since it is larger than the sum of its proper divisors (678355194224).

721090949776 is a wasteful number, since it uses less digits than its factorization.

721090949776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75239646 (or 75239640 counting only the distinct ones).

The product of its (nonzero) digits is 12002256, while the sum is 61.

The spelling of 721090949776 in words is "seven hundred twenty-one billion, ninety million, nine hundred forty-nine thousand, seven hundred seventy-six".