28578900 has 144 divisors (see below), whose sum is σ = 97771520. Its totient is φ = 6307200.

The previous prime is 28578899. The next prime is 28578919. The reversal of 28578900 is 987582.

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, 64881 + ... + 65319.

Almost surely, 2^28578900 is an apocalyptic number.

28578900 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 28578900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48885760).

28578900 is an abundant number, since it is smaller than the sum of its proper divisors (69192620).

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

28578900 is a wasteful number, since it uses less digits than its factorization.

28578900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494 (or 487 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 39.

The square root of 28578900 is about 5345.9236807122. The cubic root of 28578900 is about 305.7373541939.

The spelling of 28578900 in words is "twenty-eight million, five hundred seventy-eight thousand, nine hundred".