28891522 has 16 divisors (see below), whose sum is σ = 47361600. Its totient is φ = 13109040.

The previous prime is 28891507. The next prime is 28891529. The reversal of 28891522 is 22519882.

It is not an unprimeable number, because it can be changed into a prime (28891529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19504 + ... + 20932.

It is an arithmetic number, because the mean of its divisors is an integer number (2960100).

Almost surely, 2^28891522 is an apocalyptic number.

28891522 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

28891522 is a deficient number, since it is larger than the sum of its proper divisors (18470078).

28891522 is a wasteful number, since it uses less digits than its factorization.

28891522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2361.

The product of its digits is 23040, while the sum is 37.

The square root of 28891522 is about 5375.0834412128. The cubic root of 28891522 is about 306.8481248596.

The spelling of 28891522 in words is "twenty-eight million, eight hundred ninety-one thousand, five hundred twenty-two".