28998975 has 24 divisors (see below), whose sum is σ = 50032512. Its totient is φ = 14792800.

The previous prime is 28998971. The next prime is 28998979. The reversal of 28998975 is 57989982.

It is an interprime number because it is at equal distance from previous prime (28998971) and next prime (28998979).

It is not a de Polignac number, because 28998975 - 2² = 28998971 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28998971) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6681 + ... + 10130.

It is an arithmetic number, because the mean of its divisors is an integer number (2084688).

Almost surely, 2^28998975 is an apocalyptic number.

28998975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28998975 is a deficient number, since it is larger than the sum of its proper divisors (21033537).

28998975 is a wasteful number, since it uses less digits than its factorization.

28998975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16847 (or 16842 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 57.

The square root of 28998975 is about 5385.0696374327. The cubic root of 28998975 is about 307.2280628423.

The spelling of 28998975 in words is "twenty-eight million, nine hundred ninety-eight thousand, nine hundred seventy-five".