28526921 has 2 divisors, whose sum is σ = 28526922. Its totient is φ = 28526920.

The previous prime is 28526917. The next prime is 28526933. The reversal of 28526921 is 12962582.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28090000 + 436921 = 5300^2 + 661^2 .

It is a cyclic number.

It is not a de Polignac number, because 28526921 - 2² = 28526917 is a prime.

It is not a weakly prime, because it can be changed into another prime (28526941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14263460 + 14263461.

It is an arithmetic number, because the mean of its divisors is an integer number (14263461).

Almost surely, 2^28526921 is an apocalyptic number.

It is an amenable number.

28526921 is a deficient number, since it is larger than the sum of its proper divisors (1).

28526921 is an equidigital number, since it uses as much as digits as its factorization.

28526921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 35.

The square root of 28526921 is about 5341.0599135378. The cubic root of 28526921 is about 305.5518844199.

The spelling of 28526921 in words is "twenty-eight million, five hundred twenty-six thousand, nine hundred twenty-one".