28207489 has 8 divisors (see below), whose sum is σ = 29216000. Its totient is φ = 27205200.

The previous prime is 28207481. The next prime is 28207507. The reversal of 28207489 is 98470282.

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 28207489 - 2³ = 28207481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28207481) 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, 8887 + ... + 11635.

It is an arithmetic number, because the mean of its divisors is an integer number (3652000).

Almost surely, 2^28207489 is an apocalyptic number.

It is an amenable number.

28207489 is a deficient number, since it is larger than the sum of its proper divisors (1008511).

28207489 is a wasteful number, since it uses less digits than its factorization.

28207489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3111.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 28207489 is about 5311.0723022757. The cubic root of 28207489 is about 304.4071220352.

The spelling of 28207489 in words is "twenty-eight million, two hundred seven thousand, four hundred eighty-nine".