28889951 has 2 divisors, whose sum is σ = 28889952. Its totient is φ = 28889950.

The previous prime is 28889921. The next prime is 28889963. The reversal of 28889951 is 15998882.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28889951 - 2²² = 24695647 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28889951.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28889921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14444975 + 14444976.

It is an arithmetic number, because the mean of its divisors is an integer number (14444976).

Almost surely, 2^28889951 is an apocalyptic number.

28889951 is a deficient number, since it is larger than the sum of its proper divisors (1).

28889951 is an equidigital number, since it uses as much as digits as its factorization.

28889951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 414720, while the sum is 50.

The square root of 28889951 is about 5374.9373019599. The cubic root of 28889951 is about 306.8425630533.

The spelling of 28889951 in words is "twenty-eight million, eight hundred eighty-nine thousand, nine hundred fifty-one".