28667520 has 320 divisors, whose sum is σ = 118483200. Its totient is φ = 6469632.

The previous prime is 28667519. The next prime is 28667531. The reversal of 28667520 is 2576682.

It is a tau number, because it is divible by the number of its divisors (320).

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

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 362841 + ... + 362919.

It is an arithmetic number, because the mean of its divisors is an integer number (370260).

Almost surely, 2^28667520 is an apocalyptic number.

28667520 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 28667520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59241600).

28667520 is an abundant number, since it is smaller than the sum of its proper divisors (89815680).

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

28667520 is an equidigital number, since it uses as much as digits as its factorization.

28667520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117 (or 96 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 28667520 is about 5354.2058234625. The cubic root of 28667520 is about 306.0530473201.

The spelling of 28667520 in words is "twenty-eight million, six hundred sixty-seven thousand, five hundred twenty".