28554921 has 12 divisors (see below), whose sum is σ = 41292420. Its totient is φ = 19015200.

The previous prime is 28554919. The next prime is 28554941. The reversal of 28554921 is 12945582.

It can be written as a sum of positive squares in 2 ways, for example, as 7952400 + 20602521 = 2820^2 + 4539^2 .

It is not a de Polignac number, because 28554921 - 2¹ = 28554919 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28554941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14071 + ... + 15971.

It is an arithmetic number, because the mean of its divisors is an integer number (3441035).

Almost surely, 2^28554921 is an apocalyptic number.

It is an amenable number.

28554921 is a deficient number, since it is larger than the sum of its proper divisors (12737499).

28554921 is a wasteful number, since it uses less digits than its factorization.

28554921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3576 (or 3573 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 28554921 is about 5343.6804732319. The cubic root of 28554921 is about 305.6518210745.

It can be divided in two parts, 2855 and 4921, that added together give a 5-th power (7776 = 6⁵).

The spelling of 28554921 in words is "twenty-eight million, five hundred fifty-four thousand, nine hundred twenty-one".