721536753 has 32 divisors (see below), whose sum is σ = 1130340096. Its totient is φ = 400877568.

The previous prime is 721536707. The next prime is 721536757. The reversal of 721536753 is 357635127.

It is not a de Polignac number, because 721536753 - 2¹⁴ = 721520369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (721536757) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 122901 + ... + 128637.

It is an arithmetic number, because the mean of its divisors is an integer number (35323128).

Almost surely, 2^721536753 is an apocalyptic number.

It is an amenable number.

721536753 is a deficient number, since it is larger than the sum of its proper divisors (408803343).

721536753 is a wasteful number, since it uses less digits than its factorization.

721536753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5913.

The product of its digits is 132300, while the sum is 39.

The square root of 721536753 is about 26861.4361678597. The cubic root of 721536753 is about 896.9181639689.

The spelling of 721536753 in words is "seven hundred twenty-one million, five hundred thirty-six thousand, seven hundred fifty-three".