28071755 has 4 divisors (see below), whose sum is σ = 33686112. Its totient is φ = 22457400.

The previous prime is 28071731. The next prime is 28071761. The reversal of 28071755 is 55717082.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28071755 - 2⁶ = 28071691 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2807171 + ... + 2807180.

It is an arithmetic number, because the mean of its divisors is an integer number (8421528).

Almost surely, 2^28071755 is an apocalyptic number.

28071755 is a deficient number, since it is larger than the sum of its proper divisors (5614357).

28071755 is an equidigital number, since it uses as much as digits as its factorization.

28071755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5614356.

The product of its (nonzero) digits is 19600, while the sum is 35.

The square root of 28071755 is about 5298.2784940016. The cubic root of 28071755 is about 303.9180693048.

The spelling of 28071755 in words is "twenty-eight million, seventy-one thousand, seven hundred fifty-five".