28203780 has 96 divisors (see below), whose sum is σ = 87026688. Its totient is φ = 6768000.

The previous prime is 28203767. The next prime is 28203781. The reversal of 28203780 is 8730282.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (28203781) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 99519 + ... + 99801.

It is an arithmetic number, because the mean of its divisors is an integer number (906528).

Almost surely, 2^28203780 is an apocalyptic number.

28203780 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 28203780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43513344).

28203780 is an abundant number, since it is smaller than the sum of its proper divisors (58822908).

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

28203780 is a wasteful number, since it uses less digits than its factorization.

28203780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457 (or 455 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 28203780 is about 5310.7231146050. The cubic root of 28203780 is about 304.3937792961.

The spelling of 28203780 in words is "twenty-eight million, two hundred three thousand, seven hundred eighty".