28831647 has 8 divisors (see below), whose sum is σ = 41399344. Its totient is φ = 17742528.

The previous prime is 28831631. The next prime is 28831669. The reversal of 28831647 is 74613882.

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

It is not a de Polignac number, because 28831647 - 2⁴ = 28831631 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 739273 = 28831647 / (2 + 8 + 8 + 3 + 1 + 6 + 4 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28831687) 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, 369598 + ... + 369675.

It is an arithmetic number, because the mean of its divisors is an integer number (5174918).

Almost surely, 2^28831647 is an apocalyptic number.

28831647 is a deficient number, since it is larger than the sum of its proper divisors (12567697).

28831647 is a wasteful number, since it uses less digits than its factorization.

28831647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739289.

The product of its digits is 64512, while the sum is 39.

The square root of 28831647 is about 5369.5108715785. The cubic root of 28831647 is about 306.6360068329.

The spelling of 28831647 in words is "twenty-eight million, eight hundred thirty-one thousand, six hundred forty-seven".