28344870921 has 8 divisors (see below), whose sum is σ = 37794284064. Its totient is φ = 18896019200.

The previous prime is 28344870907. The next prime is 28344870923. The reversal of 28344870921 is 12907844382.

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 28344870921 - 2²⁶ = 28277762057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28344870923) 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, 3480 + ... + 238121.

It is an arithmetic number, because the mean of its divisors is an integer number (4724285508).

Almost surely, 2^28344870921 is an apocalyptic number.

It is an amenable number.

28344870921 is a deficient number, since it is larger than the sum of its proper divisors (9449413143).

28344870921 is a wasteful number, since it uses less digits than its factorization.

28344870921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280711.

The product of its (nonzero) digits is 774144, while the sum is 48.

The spelling of 28344870921 in words is "twenty-eight billion, three hundred forty-four million, eight hundred seventy thousand, nine hundred twenty-one".