28125009451 has 16 divisors (see below), whose sum is σ = 35075271168. Its totient is φ = 21909139200.

The previous prime is 28125009443. The next prime is 28125009461. The reversal of 28125009451 is 15490052182.

It is a cyclic number.

It is not a de Polignac number, because 28125009451 - 2³ = 28125009443 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28125009451.

It is not an unprimeable number, because it can be changed into a prime (28125009461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 218331 + ... + 322363.

It is an arithmetic number, because the mean of its divisors is an integer number (2192204448).

Almost surely, 2^28125009451 is an apocalyptic number.

28125009451 is a deficient number, since it is larger than the sum of its proper divisors (6950261717).

28125009451 is a wasteful number, since it uses less digits than its factorization.

28125009451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107562.

The product of its (nonzero) digits is 28800, while the sum is 37.

The spelling of 28125009451 in words is "twenty-eight billion, one hundred twenty-five million, nine thousand, four hundred fifty-one".