28466639 has 2 divisors, whose sum is σ = 28466640. Its totient is φ = 28466638.

The previous prime is 28466591. The next prime is 28466651. The reversal of 28466639 is 93666482.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28466639 - 2¹⁶ = 28401103 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28466639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28466689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14233319 + 14233320.

It is an arithmetic number, because the mean of its divisors is an integer number (14233320).

Almost surely, 2^28466639 is an apocalyptic number.

28466639 is a deficient number, since it is larger than the sum of its proper divisors (1).

28466639 is an equidigital number, since it uses as much as digits as its factorization.

28466639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 44.

The square root of 28466639 is about 5335.4136671865. The cubic root of 28466639 is about 305.3365057810.

The spelling of 28466639 in words is "twenty-eight million, four hundred sixty-six thousand, six hundred thirty-nine".