28457609 has 8 divisors (see below), whose sum is σ = 30350880. Its totient is φ = 26588736.

The previous prime is 28457603. The next prime is 28457633. The reversal of 28457609 is 90675482.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28457609 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28457603) 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, 3659 + ... + 8384.

It is an arithmetic number, because the mean of its divisors is an integer number (3793860).

Almost surely, 2^28457609 is an apocalyptic number.

It is an amenable number.

28457609 is a deficient number, since it is larger than the sum of its proper divisors (1893271).

28457609 is a wasteful number, since it uses less digits than its factorization.

28457609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12199.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 28457609 is about 5334.5673676504. The cubic root of 28457609 is about 305.3042167538.

The spelling of 28457609 in words is "twenty-eight million, four hundred fifty-seven thousand, six hundred nine".