28449090 has 32 divisors (see below), whose sum is σ = 75864960. Its totient is φ = 7586352.

The previous prime is 28449077. The next prime is 28449097. The reversal of 28449090 is 9094482.

It is a happy number.

28449090 is a `hidden beast` number, since 2 + 84 + 490 + 90 = 666.

It is not an unprimeable number, because it can be changed into a prime (28449097) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52414 + ... + 52953.

It is an arithmetic number, because the mean of its divisors is an integer number (2370780).

Almost surely, 2^28449090 is an apocalyptic number.

28449090 is an abundant number, since it is smaller than the sum of its proper divisors (47415870).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28449090 is a wasteful number, since it uses less digits than its factorization.

28449090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105383 (or 105377 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 28449090 is about 5333.7688363858. The cubic root of 28449090 is about 305.2737486730.

The spelling of 28449090 in words is "twenty-eight million, four hundred forty-nine thousand, ninety".