28897405 has 8 divisors (see below), whose sum is σ = 34927200. Its totient is φ = 22951056.

The previous prime is 28897397. The next prime is 28897411. The reversal of 28897405 is 50479882.

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 28897405 - 2³ = 28897397 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20095 + ... + 21484.

It is an arithmetic number, because the mean of its divisors is an integer number (4365900).

Almost surely, 2^28897405 is an apocalyptic number.

It is an amenable number.

28897405 is a deficient number, since it is larger than the sum of its proper divisors (6029795).

28897405 is a wasteful number, since it uses less digits than its factorization.

28897405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41723.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 28897405 is about 5375.6306606760. The cubic root of 28897405 is about 306.8689506345.

The spelling of 28897405 in words is "twenty-eight million, eight hundred ninety-seven thousand, four hundred five".