28981607 has 2 divisors, whose sum is σ = 28981608. Its totient is φ = 28981606.

The previous prime is 28981597. The next prime is 28981627. The reversal of 28981607 is 70618982.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28981607 - 2⁴ = 28981591 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28981627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14490803 + 14490804.

It is an arithmetic number, because the mean of its divisors is an integer number (14490804).

Almost surely, 2^28981607 is an apocalyptic number.

28981607 is a deficient number, since it is larger than the sum of its proper divisors (1).

28981607 is an equidigital number, since it uses as much as digits as its factorization.

28981607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 28981607 is about 5383.4567890901. The cubic root of 28981607 is about 307.1667158164.

Subtracting 28981607 from its reverse (70618982), we obtain a triangular number (41637375 = T₉₁₂₅).

The spelling of 28981607 in words is "twenty-eight million, nine hundred eighty-one thousand, six hundred seven".