28415989 has 8 divisors (see below), whose sum is σ = 32520320. Its totient is φ = 24322896.

The previous prime is 28415987. The next prime is 28416013. The reversal of 28415989 is 98951482.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28415989 - 2¹ = 28415987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28415983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3592 + ... + 8350.

It is an arithmetic number, because the mean of its divisors is an integer number (4065040).

Almost surely, 2^28415989 is an apocalyptic number.

It is an amenable number.

28415989 is a deficient number, since it is larger than the sum of its proper divisors (4104331).

28415989 is an equidigital number, since it uses as much as digits as its factorization.

28415989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5619.

The product of its digits is 207360, while the sum is 46.

The square root of 28415989 is about 5330.6649679003. The cubic root of 28415989 is about 305.1553056583.

The spelling of 28415989 in words is "twenty-eight million, four hundred fifteen thousand, nine hundred eighty-nine".