28154520 has 128 divisors (see below), whose sum is σ = 95040000. Its totient is φ = 7413120.

The previous prime is 28154509. The next prime is 28154537. The reversal of 28154520 is 2545182.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 141381 + ... + 141579.

It is an arithmetic number, because the mean of its divisors is an integer number (742500).

Almost surely, 2^28154520 is an apocalyptic number.

28154520 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 28154520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47520000).

28154520 is an abundant number, since it is smaller than the sum of its proper divisors (66885480).

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

28154520 is a wasteful number, since it uses less digits than its factorization.

28154520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350 (or 340 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 28154520 is about 5306.0833012685. The cubic root of 28154520 is about 304.2164605622.

The spelling of 28154520 in words is "twenty-eight million, one hundred fifty-four thousand, five hundred twenty".