28897847 has 8 divisors (see below), whose sum is σ = 31715712. Its totient is φ = 26111800.

The previous prime is 28897801. The next prime is 28897873. The reversal of 28897847 is 74879882.

It is a happy number.

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

It is not a de Polignac number, because 28897847 - 2¹² = 28893751 is a prime.

It is a super-2 number, since 2×28897847² = 1670171122470818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28897877) 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, 6029 + ... + 9702.

It is an arithmetic number, because the mean of its divisors is an integer number (3964464).

Almost surely, 2^28897847 is an apocalyptic number.

28897847 is a deficient number, since it is larger than the sum of its proper divisors (2817865).

28897847 is a wasteful number, since it uses less digits than its factorization.

28897847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15909.

The product of its digits is 1806336, while the sum is 53.

The square root of 28897847 is about 5375.6717719742. The cubic root of 28897847 is about 306.8705151970.

The spelling of 28897847 in words is "twenty-eight million, eight hundred ninety-seven thousand, eight hundred forty-seven".