28972487 has 2 divisors, whose sum is σ = 28972488. Its totient is φ = 28972486.

The previous prime is 28972453. The next prime is 28972513. The reversal of 28972487 is 78427982.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28972487 - 2⁶ = 28972423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28972417) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14486243 + 14486244.

It is an arithmetic number, because the mean of its divisors is an integer number (14486244).

Almost surely, 2^28972487 is an apocalyptic number.

28972487 is a deficient number, since it is larger than the sum of its proper divisors (1).

28972487 is an equidigital number, since it uses as much as digits as its factorization.

28972487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 451584, while the sum is 47.

The square root of 28972487 is about 5382.6096830441. The cubic root of 28972487 is about 307.1344924555.

The spelling of 28972487 in words is "twenty-eight million, nine hundred seventy-two thousand, four hundred eighty-seven".