28888440 has 192 divisors, whose sum is σ = 107114400. Its totient is φ = 6214656.

The previous prime is 28888427. The next prime is 28888451. The reversal of 28888440 is 4488882.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 28888392 and 28888401.

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, 1699312 + ... + 1699328.

Almost surely, 2^28888440 is an apocalyptic number.

28888440 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 28888440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53557200).

28888440 is an abundant number, since it is smaller than the sum of its proper divisors (78225960).

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

28888440 is a wasteful number, since it uses less digits than its factorization.

28888440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79 (or 34 counting only the distinct ones).

The product of its (nonzero) digits is 131072, while the sum is 42.

The square root of 28888440 is about 5374.7967403428. The cubic root of 28888440 is about 306.8372134747.

The spelling of 28888440 in words is "twenty-eight million, eight hundred eighty-eight thousand, four hundred forty".