28401574791 has 4 divisors (see below), whose sum is σ = 37868766392. Its totient is φ = 18934383192.

The previous prime is 28401574787. The next prime is 28401574793. The reversal of 28401574791 is 19747510482.

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

It is not a de Polignac number, because 28401574791 - 2² = 28401574787 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28401574791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28401574793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4733595796 + ... + 4733595801.

It is an arithmetic number, because the mean of its divisors is an integer number (9467191598).

Almost surely, 2^28401574791 is an apocalyptic number.

28401574791 is a deficient number, since it is larger than the sum of its proper divisors (9467191601).

28401574791 is an equidigital number, since it uses as much as digits as its factorization.

28401574791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9467191600.

The product of its (nonzero) digits is 564480, while the sum is 48.

The spelling of 28401574791 in words is "twenty-eight billion, four hundred one million, five hundred seventy-four thousand, seven hundred ninety-one".