28301940 has 96 divisors (see below), whose sum is σ = 93260160. Its totient is φ = 7100928.

The previous prime is 28301893. The next prime is 28301951. The reversal of 28301940 is 4910382.

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 polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7639 + ... + 10721.

It is an arithmetic number, because the mean of its divisors is an integer number (971460).

Almost surely, 2^28301940 is an apocalyptic number.

28301940 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 28301940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46630080).

28301940 is an abundant number, since it is smaller than the sum of its proper divisors (64958220).

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

28301940 is a wasteful number, since it uses less digits than its factorization.

28301940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3118 (or 3110 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 28301940 is about 5319.9567667416. The cubic root of 28301940 is about 304.7465062052.

It can be divided in two parts, 28301 and 940, that added together give a square (29241 = 171²).

The spelling of 28301940 in words is "twenty-eight million, three hundred one thousand, nine hundred forty".