15428887 has 2 divisors, whose sum is σ = 15428888. Its totient is φ = 15428886.

The previous prime is 15428857. The next prime is 15428891. The reversal of 15428887 is 78882451.

It is a strong prime.

It is an emirp because it is prime and its reverse (78882451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15428887 - 2⁷ = 15428759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15428857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7714443 + 7714444.

It is an arithmetic number, because the mean of its divisors is an integer number (7714444).

Almost surely, 2^15428887 is an apocalyptic number.

15428887 is a deficient number, since it is larger than the sum of its proper divisors (1).

15428887 is an equidigital number, since it uses as much as digits as its factorization.

15428887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 143360, while the sum is 43.

The square root of 15428887 is about 3927.9621943191. The cubic root of 15428887 is about 248.9496573009.

The spelling of 15428887 in words is "fifteen million, four hundred twenty-eight thousand, eight hundred eighty-seven".