721269132 has 96 divisors (see below), whose sum is σ = 1818432000. Its totient is φ = 221709312.

The previous prime is 721269079. The next prime is 721269151. The reversal of 721269132 is 231962127.

It is a junction number, because it is equal to n+sod(n) for n = 721269093 and 721269102.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3624369 + ... + 3624567.

It is an arithmetic number, because the mean of its divisors is an integer number (18942000).

Almost surely, 2^721269132 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721269132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (909216000).

721269132 is an abundant number, since it is smaller than the sum of its proper divisors (1097162868).

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

721269132 is a wasteful number, since it uses less digits than its factorization.

721269132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495 (or 493 counting only the distinct ones).

The product of its digits is 9072, while the sum is 33.

The square root of 721269132 is about 26856.4541963380. The cubic root of 721269132 is about 896.8072600232.

The spelling of 721269132 in words is "seven hundred twenty-one million, two hundred sixty-nine thousand, one hundred thirty-two".