28404981491 has 8 divisors (see below), whose sum is σ = 28963239984. Its totient is φ = 27847549600.

The previous prime is 28404981487. The next prime is 28404981497. The reversal of 28404981491 is 19418940482.

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 28404981491 - 2² = 28404981487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28404981497) 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, 137021 + ... + 274926.

It is an arithmetic number, because the mean of its divisors is an integer number (3620404998).

Almost surely, 2^28404981491 is an apocalyptic number.

28404981491 is a deficient number, since it is larger than the sum of its proper divisors (558258493).

28404981491 is a wasteful number, since it uses less digits than its factorization.

28404981491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413301.

The product of its (nonzero) digits is 663552, while the sum is 50.

The spelling of 28404981491 in words is "twenty-eight billion, four hundred four million, nine hundred eighty-one thousand, four hundred ninety-one".