28489775 has 12 divisors (see below), whose sum is σ = 36467904. Its totient is φ = 22056000.

The previous prime is 28489771. The next prime is 28489781. The reversal of 28489775 is 57798482.

It is not a de Polignac number, because 28489775 - 2² = 28489771 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28489771) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17606 + ... + 19155.

It is an arithmetic number, because the mean of its divisors is an integer number (3038992).

Almost surely, 2^28489775 is an apocalyptic number.

28489775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28489775 is a deficient number, since it is larger than the sum of its proper divisors (7978129).

28489775 is a wasteful number, since it uses less digits than its factorization.

28489775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36802 (or 36797 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 50.

The square root of 28489775 is about 5337.5813811126. The cubic root of 28489775 is about 305.4192031969.

The spelling of 28489775 in words is "twenty-eight million, four hundred eighty-nine thousand, seven hundred seventy-five".