28401276591 has 16 divisors (see below), whose sum is σ = 42203096320. Its totient is φ = 18876975480.

The previous prime is 28401276581. The next prime is 28401276601. The reversal of 28401276591 is 19567210482.

28401276591 is a `hidden beast` number, since 2 + 8 + 40 + 12 + 7 + 6 + 591 = 666.

It is an interprime number because it is at equal distance from previous prime (28401276581) and next prime (28401276601).

It is not a de Polignac number, because 28401276591 - 2²⁶ = 28334167727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28401276521) 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, 1580035 + ... + 1597908.

It is an arithmetic number, because the mean of its divisors is an integer number (2637693520).

Almost surely, 2^28401276591 is an apocalyptic number.

28401276591 is a deficient number, since it is larger than the sum of its proper divisors (13801819729).

28401276591 is a wasteful number, since it uses less digits than its factorization.

28401276591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3178283 (or 3178277 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 28401276591 in words is "twenty-eight billion, four hundred one million, two hundred seventy-six thousand, five hundred ninety-one".