28519920 has 240 divisors, whose sum is σ = 112930272. Its totient is φ = 6359040.

The previous prime is 28519913. The next prime is 28519921. The reversal of 28519920 is 2991582.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28519921) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 102822 + ... + 103098.

Almost surely, 2^28519920 is an apocalyptic number.

28519920 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 28519920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56465136).

28519920 is an abundant number, since it is smaller than the sum of its proper divisors (84410352).

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

28519920 is a wasteful number, since it uses less digits than its factorization.

28519920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320 (or 311 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 28519920 is about 5340.4044790634. The cubic root of 28519920 is about 305.5268864684.

The spelling of 28519920 in words is "twenty-eight million, five hundred nineteen thousand, nine hundred twenty".