28940340 has 96 divisors (see below), whose sum is σ = 95227776. Its totient is φ = 6474240.

The previous prime is 28940321. The next prime is 28940369. The reversal of 28940340 is 4304982.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 28940298 and 28940307.

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, 6894 + ... + 10266.

It is an arithmetic number, because the mean of its divisors is an integer number (991956).

Almost surely, 2^28940340 is an apocalyptic number.

28940340 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 28940340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47613888).

28940340 is an abundant number, since it is smaller than the sum of its proper divisors (66287436).

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

28940340 is a wasteful number, since it uses less digits than its factorization.

28940340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3409 (or 3407 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 28940340 is about 5379.6226633473. The cubic root of 28940340 is about 307.0208546843.

The spelling of 28940340 in words is "twenty-eight million, nine hundred forty thousand, three hundred forty".