28791655 has 8 divisors (see below), whose sum is σ = 34627392. Its totient is φ = 22981728.

The previous prime is 28791647. The next prime is 28791671. The reversal of 28791655 is 55619782.

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 28791655 - 2³ = 28791647 is a prime.

It is a Duffinian number.

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, 3904 + ... + 8533.

It is an arithmetic number, because the mean of its divisors is an integer number (4328424).

Almost surely, 2^28791655 is an apocalyptic number.

28791655 is a deficient number, since it is larger than the sum of its proper divisors (5835737).

28791655 is a wasteful number, since it uses less digits than its factorization.

28791655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12905.

The product of its digits is 151200, while the sum is 43.

The square root of 28791655 is about 5365.7855902002. The cubic root of 28791655 is about 306.4941643002.

The spelling of 28791655 in words is "twenty-eight million, seven hundred ninety-one thousand, six hundred fifty-five".