28207421639 has 8 divisors (see below), whose sum is σ = 29007290880. Its totient is φ = 27409526496.

The previous prime is 28207421623. The next prime is 28207421647. The reversal of 28207421639 is 93612470282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28207421639 - 2⁴ = 28207421623 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 28207421639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28207471639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 464519 + ... + 521720.

It is an arithmetic number, because the mean of its divisors is an integer number (3625911360).

Almost surely, 2^28207421639 is an apocalyptic number.

28207421639 is a deficient number, since it is larger than the sum of its proper divisors (799869241).

28207421639 is an equidigital number, since it uses as much as digits as its factorization.

28207421639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987049.

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 28207421639 in words is "twenty-eight billion, two hundred seven million, four hundred twenty-one thousand, six hundred thirty-nine".