28887501 has 4 divisors (see below), whose sum is σ = 38516672. Its totient is φ = 19258332.

The previous prime is 28887497. The next prime is 28887511. The reversal of 28887501 is 10578882.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28887501 - 2² = 28887497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28887501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28887511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4814581 + ... + 4814586.

It is an arithmetic number, because the mean of its divisors is an integer number (9629168).

Almost surely, 2^28887501 is an apocalyptic number.

It is an amenable number.

28887501 is a deficient number, since it is larger than the sum of its proper divisors (9629171).

28887501 is an equidigital number, since it uses as much as digits as its factorization.

28887501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9629170.

The product of its (nonzero) digits is 35840, while the sum is 39.

The square root of 28887501 is about 5374.7093874925. The cubic root of 28887501 is about 306.8338889238.

The spelling of 28887501 in words is "twenty-eight million, eight hundred eighty-seven thousand, five hundred one".