28307525278 has 4 divisors (see below), whose sum is σ = 42461287920. Its totient is φ = 14153762638.

The previous prime is 28307525273. The next prime is 28307525317. The reversal of 28307525278 is 87252570382.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28307525273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7076881318 + ... + 7076881321.

It is an arithmetic number, because the mean of its divisors is an integer number (10615321980).

Almost surely, 2^28307525278 is an apocalyptic number.

28307525278 is a deficient number, since it is larger than the sum of its proper divisors (14153762642).

28307525278 is a wasteful number, since it uses less digits than its factorization.

28307525278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14153762641.

The product of its (nonzero) digits is 1881600, while the sum is 49.

The spelling of 28307525278 in words is "twenty-eight billion, three hundred seven million, five hundred twenty-five thousand, two hundred seventy-eight".