28372621 has 2 divisors, whose sum is σ = 28372622. Its totient is φ = 28372620.

The previous prime is 28372601. The next prime is 28372627. The reversal of 28372621 is 12627382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25857225 + 2515396 = 5085^2 + 1586^2 .

It is a cyclic number.

It is not a de Polignac number, because 28372621 - 2¹⁵ = 28339853 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28372627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14186310 + 14186311.

It is an arithmetic number, because the mean of its divisors is an integer number (14186311).

Almost surely, 2^28372621 is an apocalyptic number.

It is an amenable number.

28372621 is a deficient number, since it is larger than the sum of its proper divisors (1).

28372621 is an equidigital number, since it uses as much as digits as its factorization.

28372621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 31.

The square root of 28372621 is about 5326.5956294804. The cubic root of 28372621 is about 304.9999856669. Note that the first 4 decimals are identical.

The spelling of 28372621 in words is "twenty-eight million, three hundred seventy-two thousand, six hundred twenty-one".