721542753 has 12 divisors (see below), whose sum is σ = 1050436608. Its totient is φ = 477240120.

The previous prime is 721542751. The next prime is 721542761. The reversal of 721542753 is 357245127.

It is not a de Polignac number, because 721542753 - 2¹ = 721542751 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (721542751) 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, 314493 + ... + 316778.

It is an arithmetic number, because the mean of its divisors is an integer number (87536384).

Almost surely, 2^721542753 is an apocalyptic number.

It is an amenable number.

721542753 is a deficient number, since it is larger than the sum of its proper divisors (328893855).

721542753 is a wasteful number, since it uses less digits than its factorization.

721542753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631404 (or 631401 counting only the distinct ones).

The product of its digits is 58800, while the sum is 36.

The square root of 721542753 is about 26861.5478519016. The cubic root of 721542753 is about 896.9206500950.

The spelling of 721542753 in words is "seven hundred twenty-one million, five hundred forty-two thousand, seven hundred fifty-three".