28005655 has 8 divisors (see below), whose sum is σ = 34322112. Its totient is φ = 21927648.

The previous prime is 28005641. The next prime is 28005661. The reversal of 28005655 is 55650082.

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 28005655 - 2⁵ = 28005623 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, 59352 + ... + 59821.

It is an arithmetic number, because the mean of its divisors is an integer number (4290264).

Almost surely, 2^28005655 is an apocalyptic number.

28005655 is a deficient number, since it is larger than the sum of its proper divisors (6316457).

28005655 is a wasteful number, since it uses less digits than its factorization.

28005655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119225.

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 28005655 is about 5292.0369424259. The cubic root of 28005655 is about 303.6793385622.

The spelling of 28005655 in words is "twenty-eight million, five thousand, six hundred fifty-five".