28881045 has 48 divisors (see below), whose sum is σ = 55823040. Its totient is φ = 13727232.

The previous prime is 28881037. The next prime is 28881059. The reversal of 28881045 is 54018882.

It is not a de Polignac number, because 28881045 - 2³ = 28881037 is a prime.

It is a super-2 number, since 2×28881045² = 1668229520584050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13542 + ... + 15528.

It is an arithmetic number, because the mean of its divisors is an integer number (1162980).

Almost surely, 2^28881045 is an apocalyptic number.

It is an amenable number.

28881045 is a deficient number, since it is larger than the sum of its proper divisors (26941995).

28881045 is a wasteful number, since it uses less digits than its factorization.

28881045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2034 (or 2031 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 28881045 is about 5374.1087633207. The cubic root of 28881045 is about 306.8110293581.

The spelling of 28881045 in words is "twenty-eight million, eight hundred eighty-one thousand, forty-five".