28405655 has 8 divisors (see below), whose sum is σ = 34595952. Its totient is φ = 22385088.

The previous prime is 28405639. The next prime is 28405673. The reversal of 28405655 is 55650482.

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 28405655 - 2⁴ = 28405639 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, 42062 + ... + 42731.

It is an arithmetic number, because the mean of its divisors is an integer number (4324494).

Almost surely, 2^28405655 is an apocalyptic number.

28405655 is a deficient number, since it is larger than the sum of its proper divisors (6190297).

28405655 is an equidigital number, since it uses as much as digits as its factorization.

28405655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84865.

The product of its (nonzero) digits is 48000, while the sum is 35.

The square root of 28405655 is about 5329.6955823011. The cubic root of 28405655 is about 305.1183093827.

The spelling of 28405655 in words is "twenty-eight million, four hundred five thousand, six hundred fifty-five".