28724418705 has 32 divisors (see below), whose sum is σ = 46235867904. Its totient is φ = 15227559936.

The previous prime is 28724418703. The next prime is 28724418707. The reversal of 28724418705 is 50781442782.

It is an interprime number because it is at equal distance from previous prime (28724418703) and next prime (28724418707).

It is not a de Polignac number, because 28724418705 - 2¹ = 28724418703 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28724418703) 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, 4185637 + ... + 4192493.

It is an arithmetic number, because the mean of its divisors is an integer number (1444870872).

Almost surely, 2^28724418705 is an apocalyptic number.

It is an amenable number.

28724418705 is a deficient number, since it is larger than the sum of its proper divisors (17511449199).

28724418705 is a wasteful number, since it uses less digits than its factorization.

28724418705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8505.

The product of its (nonzero) digits is 1003520, while the sum is 48.

The spelling of 28724418705 in words is "twenty-eight billion, seven hundred twenty-four million, four hundred eighteen thousand, seven hundred five".