721736033 has 12 divisors (see below), whose sum is σ = 774384240. Its totient is φ = 670799376.

The previous prime is 721736027. The next prime is 721736051. The reversal of 721736033 is 330637127.

It is not a de Polignac number, because 721736033 - 2¹⁶ = 721670497 is a prime.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721736053) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46610 + ... + 60132.

It is an arithmetic number, because the mean of its divisors is an integer number (64532020).

Almost surely, 2^721736033 is an apocalyptic number.

It is an amenable number.

721736033 is a deficient number, since it is larger than the sum of its proper divisors (52648207).

721736033 is a wasteful number, since it uses less digits than its factorization.

721736033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13648 (or 13595 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 32.

The square root of 721736033 is about 26865.1453187955. The cubic root of 721736033 is about 897.0007291320. Note that the first 3 decimals are identical.

The spelling of 721736033 in words is "seven hundred twenty-one million, seven hundred thirty-six thousand, thirty-three".