28955520 has 192 divisors, whose sum is σ = 109315440. Its totient is φ = 7004160.

The previous prime is 28955513. The next prime is 28955569. The reversal of 28955520 is 2555982.

28955520 is a `hidden beast` number, since 2 + 89 + 55 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63132 + ... + 63588.

Almost surely, 2^28955520 is an apocalyptic number.

28955520 is a gapful number since it is divisible by the number (20) 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 28955520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54657720).

28955520 is an abundant number, since it is smaller than the sum of its proper divisors (80359920).

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

28955520 is a wasteful number, since it uses less digits than its factorization.

28955520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493 (or 478 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The square root of 28955520 is about 5381.0333580085. The cubic root of 28955520 is about 307.0745255804.

The spelling of 28955520 in words is "twenty-eight million, nine hundred fifty-five thousand, five hundred twenty".