28077855 has 32 divisors (see below), whose sum is σ = 48861120. Its totient is φ = 13685760.

The previous prime is 28077853. The next prime is 28077869. The reversal of 28077855 is 55877082.

It is a happy number.

It is not a de Polignac number, because 28077855 - 2¹ = 28077853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28077851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20595 + ... + 21915.

It is an arithmetic number, because the mean of its divisors is an integer number (1526910).

Almost surely, 2^28077855 is an apocalyptic number.

28077855 is a deficient number, since it is larger than the sum of its proper divisors (20783265).

28077855 is a wasteful number, since it uses less digits than its factorization.

28077855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1451.

The product of its (nonzero) digits is 156800, while the sum is 42.

The square root of 28077855 is about 5298.8541214115. The cubic root of 28077855 is about 303.9400815369.

The spelling of 28077855 in words is "twenty-eight million, seventy-seven thousand, eight hundred fifty-five".