28666951 has 2 divisors, whose sum is σ = 28666952. Its totient is φ = 28666950.

The previous prime is 28666949. The next prime is 28666969. The reversal of 28666951 is 15966682.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28666951 - 2¹ = 28666949 is a prime.

Together with 28666949, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 28666898 and 28666907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28666921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14333475 + 14333476.

It is an arithmetic number, because the mean of its divisors is an integer number (14333476).

Almost surely, 2^28666951 is an apocalyptic number.

28666951 is a deficient number, since it is larger than the sum of its proper divisors (1).

28666951 is an equidigital number, since it uses as much as digits as its factorization.

28666951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 43.

The square root of 28666951 is about 5354.1526874007. The cubic root of 28666951 is about 306.0510224346.

The spelling of 28666951 in words is "twenty-eight million, six hundred sixty-six thousand, nine hundred fifty-one".