28155264 has 128 divisors (see below), whose sum is σ = 83721600. Its totient is φ = 8331264.

The previous prime is 28155251. The next prime is 28155269. The reversal of 28155264 is 46255182.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28155269) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123919 + ... + 124145.

It is an arithmetic number, because the mean of its divisors is an integer number (654075).

Almost surely, 2^28155264 is an apocalyptic number.

28155264 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 28155264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41860800).

28155264 is an abundant number, since it is smaller than the sum of its proper divisors (55566336).

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

28155264 is a wasteful number, since it uses less digits than its factorization.

28155264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280 (or 268 counting only the distinct ones).

The product of its digits is 19200, while the sum is 33.

The square root of 28155264 is about 5306.1534090149. The cubic root of 28155264 is about 304.2191402391.

The spelling of 28155264 in words is "twenty-eight million, one hundred fifty-five thousand, two hundred sixty-four".