28749501 has 12 divisors (see below), whose sum is σ = 45302400. Its totient is φ = 17423880.

The previous prime is 28749467. The next prime is 28749503. The reversal of 28749501 is 10594782.

It is not a de Polignac number, because 28749501 - 2¹⁰ = 28748477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28749503) 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 11 ways as a sum of consecutive naturals, for example, 145101 + ... + 145298.

It is an arithmetic number, because the mean of its divisors is an integer number (3775200).

Almost surely, 2^28749501 is an apocalyptic number.

It is an amenable number.

28749501 is a deficient number, since it is larger than the sum of its proper divisors (16552899).

28749501 is a wasteful number, since it uses less digits than its factorization.

28749501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290416 (or 290413 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 28749501 is about 5361.8561151900. The cubic root of 28749501 is about 306.3445113825.

The spelling of 28749501 in words is "twenty-eight million, seven hundred forty-nine thousand, five hundred one".