28077864 has 64 divisors (see below), whose sum is σ = 72576000. Its totient is φ = 9048000.

The previous prime is 28077853. The next prime is 28077869. The reversal of 28077864 is 46877082.

It is not an unprimeable number, because it can be changed into a prime (28077869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111739 + ... + 111989.

It is an arithmetic number, because the mean of its divisors is an integer number (1134000).

Almost surely, 2^28077864 is an apocalyptic number.

28077864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28077864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36288000).

28077864 is an abundant number, since it is smaller than the sum of its proper divisors (44498136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28077864 is a wasteful number, since it uses less digits than its factorization.

28077864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398 (or 394 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 42.

The square root of 28077864 is about 5298.8549706517. The cubic root of 28077864 is about 303.9401140116.

The spelling of 28077864 in words is "twenty-eight million, seventy-seven thousand, eight hundred sixty-four".