8730721453 has 4 divisors (see below), whose sum is σ = 8740632348. Its totient is φ = 8720810560.

The previous prime is 8730721427. The next prime is 8730721459. The reversal of 8730721453 is 3541270378.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3541270378 = 2 ⋅1770635189.

It can be written as a sum of positive squares in 2 ways, for example, as 630361449 + 8100360004 = 25107^2 + 90002^2 .

It is a cyclic number.

It is not a de Polignac number, because 8730721453 - 2¹³ = 8730713261 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8730721459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4954126 + ... + 4955887.

It is an arithmetic number, because the mean of its divisors is an integer number (2185158087).

Almost surely, 2^8730721453 is an apocalyptic number.

It is an amenable number.

8730721453 is a deficient number, since it is larger than the sum of its proper divisors (9910895).

8730721453 is an equidigital number, since it uses as much as digits as its factorization.

8730721453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9910894.

The product of its (nonzero) digits is 141120, while the sum is 40.

The square root of 8730721453 is about 93438.3296779218. The cubic root of 8730721453 is about 2059.1281581829.

The spelling of 8730721453 in words is "eight billion, seven hundred thirty million, seven hundred twenty-one thousand, four hundred fifty-three".