28851919 has 2 divisors, whose sum is σ = 28851920. Its totient is φ = 28851918.

The previous prime is 28851883. The next prime is 28851947. The reversal of 28851919 is 91915882.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28851919 - 2⁷ = 28851791 is a prime.

It is a super-2 number, since 2×28851919² = 1664866459965122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28851619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14425959 + 14425960.

It is an arithmetic number, because the mean of its divisors is an integer number (14425960).

Almost surely, 2^28851919 is an apocalyptic number.

28851919 is a deficient number, since it is larger than the sum of its proper divisors (1).

28851919 is an equidigital number, since it uses as much as digits as its factorization.

28851919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 43.

The square root of 28851919 is about 5371.3982350967. The cubic root of 28851919 is about 306.7078569174.

The spelling of 28851919 in words is "twenty-eight million, eight hundred fifty-one thousand, nine hundred nineteen".