28971619 has 2 divisors, whose sum is σ = 28971620. Its totient is φ = 28971618.

The previous prime is 28971611. The next prime is 28971623. The reversal of 28971619 is 91617982.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28971619 - 2³ = 28971611 is a prime.

It is a super-2 number, since 2×28971619² = 1678709414962322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28971611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14485809 + 14485810.

It is an arithmetic number, because the mean of its divisors is an integer number (14485810).

Almost surely, 2^28971619 is an apocalyptic number.

28971619 is a deficient number, since it is larger than the sum of its proper divisors (1).

28971619 is an equidigital number, since it uses as much as digits as its factorization.

28971619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 43.

The square root of 28971619 is about 5382.5290524065. The cubic root of 28971619 is about 307.1314252306.

The spelling of 28971619 in words is "twenty-eight million, nine hundred seventy-one thousand, six hundred nineteen".