28524780 has 72 divisors (see below), whose sum is σ = 88884432. Its totient is φ = 7399296.

The previous prime is 28524779. The next prime is 28524787. The reversal of 28524780 is 8742582.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (28524787) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4519 + ... + 8801.

It is an arithmetic number, because the mean of its divisors is an integer number (1234506).

Almost surely, 2^28524780 is an apocalyptic number.

28524780 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 28524780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44442216).

28524780 is an abundant number, since it is smaller than the sum of its proper divisors (60359652).

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

28524780 is a wasteful number, since it uses less digits than its factorization.

28524780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4335 (or 4330 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 28524780 is about 5340.8594813944. The cubic root of 28524780 is about 305.5442401442.

The spelling of 28524780 in words is "twenty-eight million, five hundred twenty-four thousand, seven hundred eighty".