28078771 has 8 divisors (see below), whose sum is σ = 32127840. Its totient is φ = 24039168.

The previous prime is 28078763. The next prime is 28078783. The reversal of 28078771 is 17787082.

It is a happy number.

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 28078771 - 2³ = 28078763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28078741) 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, 5955 + ... + 9571.

It is an arithmetic number, because the mean of its divisors is an integer number (4015980).

Almost surely, 2^28078771 is an apocalyptic number.

28078771 is a deficient number, since it is larger than the sum of its proper divisors (4049069).

28078771 is a wasteful number, since it uses less digits than its factorization.

28078771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4733.

The product of its (nonzero) digits is 43904, while the sum is 40.

The square root of 28078771 is about 5298.9405544882. The cubic root of 28078771 is about 303.9433867049.

The spelling of 28078771 in words is "twenty-eight million, seventy-eight thousand, seven hundred seventy-one".