28988641 has 4 divisors (see below), whose sum is σ = 31623984. Its totient is φ = 26353300.

The previous prime is 28988633. The next prime is 28988653. The reversal of 28988641 is 14688982.

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 a cyclic number.

It is not a de Polignac number, because 28988641 - 2³ = 28988633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28988591 and 28988600.

It is not an unprimeable number, because it can be changed into a prime (28988611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1317655 + ... + 1317676.

It is an arithmetic number, because the mean of its divisors is an integer number (7905996).

Almost surely, 2^28988641 is an apocalyptic number.

It is an amenable number.

28988641 is a deficient number, since it is larger than the sum of its proper divisors (2635343).

28988641 is a wasteful number, since it uses less digits than its factorization.

28988641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2635342.

The product of its digits is 221184, while the sum is 46.

The square root of 28988641 is about 5384.1100471666. The cubic root of 28988641 is about 307.1915641729.

The spelling of 28988641 in words is "twenty-eight million, nine hundred eighty-eight thousand, six hundred forty-one".