6429000721 has 64 divisors (see below), whose sum is σ = 8475667200. Its totient is φ = 4777574400.

The previous prime is 6429000713. The next prime is 6429000761. The reversal of 6429000721 is 1270009246.

It is a 6-Lehmer number, since φ(6429000721) divides (6429000721-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 6429000721 - 2³ = 6429000713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6429000701) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8359825 + ... + 8360593.

It is an arithmetic number, because the mean of its divisors is an integer number (132432300).

Almost surely, 2^6429000721 is an apocalyptic number.

It is an amenable number.

6429000721 is a deficient number, since it is larger than the sum of its proper divisors (2046666479).

6429000721 is a wasteful number, since it uses less digits than its factorization.

6429000721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 6429000721 is about 80181.0496376794. The cubic root of 6429000721 is about 1859.4356711888.

Adding to 6429000721 its reverse (1270009246), we get a palindrome (7699009967).

The spelling of 6429000721 in words is "six billion, four hundred twenty-nine million, seven hundred twenty-one", and thus it is an aban number.