28149675621 has 8 divisors (see below), whose sum is σ = 37533987744. Its totient is φ = 18765906960.

The previous prime is 28149675529. The next prime is 28149675637. The reversal of 28149675621 is 12657694182.

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

It is not a de Polignac number, because 28149675621 - 2⁷ = 28149675493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28149685621) 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, 6226 + ... + 237356.

It is an arithmetic number, because the mean of its divisors is an integer number (4691748468).

Almost surely, 2^28149675621 is an apocalyptic number.

It is an amenable number.

28149675621 is a deficient number, since it is larger than the sum of its proper divisors (9384312123).

28149675621 is a wasteful number, since it uses less digits than its factorization.

28149675621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271731.

The product of its digits is 1451520, while the sum is 51.

The spelling of 28149675621 in words is "twenty-eight billion, one hundred forty-nine million, six hundred seventy-five thousand, six hundred twenty-one".