721280865104 has 80 divisors (see below), whose sum is σ = 1435927844736. Its totient is φ = 350876736000.

The previous prime is 721280865103. The next prime is 721280865113. The reversal of 721280865104 is 401568082127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721280865103) 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, 35213714 + ... + 35234190.

Almost surely, 2^721280865104 is an apocalyptic number.

It is an amenable number.

721280865104 is a deficient number, since it is larger than the sum of its proper divisors (714646979632).

721280865104 is a wasteful number, since it uses less digits than its factorization.

721280865104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20964 (or 20958 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 44.

The spelling of 721280865104 in words is "seven hundred twenty-one billion, two hundred eighty million, eight hundred sixty-five thousand, one hundred four".