28628340 has 144 divisors (see below), whose sum is σ = 92424192. Its totient is φ = 6580224.

The previous prime is 28628297. The next prime is 28628359. The reversal of 28628340 is 4382682.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 225357 + ... + 225483.

Almost surely, 2^28628340 is an apocalyptic number.

28628340 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 28628340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46212096).

28628340 is an abundant number, since it is smaller than the sum of its proper divisors (63795852).

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

28628340 is a wasteful number, since it uses less digits than its factorization.

28628340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 28628340 is about 5350.5457665550. The cubic root of 28628340 is about 305.9135558290.

The spelling of 28628340 in words is "twenty-eight million, six hundred twenty-eight thousand, three hundred forty".