28898991 has 16 divisors (see below), whose sum is σ = 46705920. Its totient is φ = 17514360.

The previous prime is 28898983. The next prime is 28899001. The reversal of 28898991 is 19989882.

It is a happy number.

It is not a de Polignac number, because 28898991 - 2³ = 28898983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28898951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48355 + ... + 48948.

It is an arithmetic number, because the mean of its divisors is an integer number (2919120).

Almost surely, 2^28898991 is an apocalyptic number.

28898991 is a deficient number, since it is larger than the sum of its proper divisors (17806929).

28898991 is a wasteful number, since it uses less digits than its factorization.

28898991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97323 (or 97317 counting only the distinct ones).

The product of its digits is 746496, while the sum is 54.

The square root of 28898991 is about 5375.7781762271. The cubic root of 28898991 is about 306.8745645786.

The spelling of 28898991 in words is "twenty-eight million, eight hundred ninety-eight thousand, nine hundred ninety-one".