28578720 has 48 divisors (see below), whose sum is σ = 90024480. Its totient is φ = 7620864.

The previous prime is 28578709. The next prime is 28578721. The reversal of 28578720 is 2787582.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (28578721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29290 + ... + 30249.

It is an arithmetic number, because the mean of its divisors is an integer number (1875510).

Almost surely, 2^28578720 is an apocalyptic number.

28578720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28578720 is an abundant number, since it is smaller than the sum of its proper divisors (61445760).

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

28578720 is a wasteful number, since it uses less digits than its factorization.

28578720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59557 (or 59549 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 39.

The square root of 28578720 is about 5345.9068454286. The cubic root of 28578720 is about 305.7367123119.

The spelling of 28578720 in words is "twenty-eight million, five hundred seventy-eight thousand, seven hundred twenty".