28881679 has 2 divisors, whose sum is σ = 28881680. Its totient is φ = 28881678.

The previous prime is 28881673. The next prime is 28881703. The reversal of 28881679 is 97618882.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28881679 - 2⁷ = 28881551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28881673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14440839 + 14440840.

It is an arithmetic number, because the mean of its divisors is an integer number (14440840).

Almost surely, 2^28881679 is an apocalyptic number.

28881679 is a deficient number, since it is larger than the sum of its proper divisors (1).

28881679 is an equidigital number, since it uses as much as digits as its factorization.

28881679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 49.

The square root of 28881679 is about 5374.1677495218. The cubic root of 28881679 is about 306.8132743920.

The spelling of 28881679 in words is "twenty-eight million, eight hundred eighty-one thousand, six hundred seventy-nine".