7257228729 has 8 divisors (see below), whose sum is σ = 9937826880. Its totient is φ = 4707391536.

The previous prime is 7257228689. The next prime is 7257228751. The reversal of 7257228729 is 9278227527.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7257228729 - 2¹⁵ = 7257195961 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7257228799) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32690109 + ... + 32690330.

It is an arithmetic number, because the mean of its divisors is an integer number (1242228360).

Almost surely, 2^7257228729 is an apocalyptic number.

It is an amenable number.

7257228729 is a deficient number, since it is larger than the sum of its proper divisors (2680598151).

7257228729 is a wasteful number, since it uses less digits than its factorization.

7257228729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65380479.

The product of its digits is 1975680, while the sum is 51.

The square root of 7257228729 is about 85189.3698122013. The cubic root of 7257228729 is about 1936.0813599362.

The spelling of 7257228729 in words is "seven billion, two hundred fifty-seven million, two hundred twenty-eight thousand, seven hundred twenty-nine".