28421718725 has 24 divisors (see below), whose sum is σ = 35358495840. Its totient is φ = 22662960320.

The previous prime is 28421718701. The next prime is 28421718817. The reversal of 28421718725 is 52781712482.

It is not a de Polignac number, because 28421718725 - 2¹⁴ = 28421702341 is a prime.

Its product of digits (501760) is a multiple of the sum of its prime divisors (3584).

It is a self number, because there is not a number n which added to its sum of digits gives 28421718725.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14188574 + ... + 14190576.

It is an arithmetic number, because the mean of its divisors is an integer number (1473270660).

Almost surely, 2^28421718725 is an apocalyptic number.

28421718725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28421718725 is a deficient number, since it is larger than the sum of its proper divisors (6936777115).

28421718725 is a wasteful number, since it uses less digits than its factorization.

28421718725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3589 (or 3584 counting only the distinct ones).

The product of its digits is 501760, while the sum is 47.

The spelling of 28421718725 in words is "twenty-eight billion, four hundred twenty-one million, seven hundred eighteen thousand, seven hundred twenty-five".