721354536 has 96 divisors (see below), whose sum is σ = 2241258240. Its totient is φ = 205317504.

The previous prime is 721354483. The next prime is 721354561. The reversal of 721354536 is 635453127.

721354536 is a `hidden beast` number, since 72 + 1 + 3 + 54 + 536 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 721354536.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 137025 + ... + 142191.

It is an arithmetic number, because the mean of its divisors is an integer number (23346440).

Almost surely, 2^721354536 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 721354536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1120629120).

721354536 is an abundant number, since it is smaller than the sum of its proper divisors (1519903704).

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

721354536 is a wasteful number, since it uses less digits than its factorization.

721354536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5463 (or 5456 counting only the distinct ones).

The product of its digits is 75600, while the sum is 36.

The square root of 721354536 is about 26858.0441581289. The cubic root of 721354536 is about 896.8426549962.

The spelling of 721354536 in words is "seven hundred twenty-one million, three hundred fifty-four thousand, five hundred thirty-six".