28720552 has 32 divisors (see below), whose sum is σ = 64785600. Its totient is φ = 11660544.

The previous prime is 28720513. The next prime is 28720553. The reversal of 28720552 is 25502782.

It is not an unprimeable number, because it can be changed into a prime (28720553) 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, 12433 + ... + 14560.

It is an arithmetic number, because the mean of its divisors is an integer number (2024550).

Almost surely, 2^28720552 is an apocalyptic number.

It is an amenable number.

28720552 is an abundant number, since it is smaller than the sum of its proper divisors (36065048).

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

28720552 is a wasteful number, since it uses less digits than its factorization.

28720552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27025 (or 27021 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 31.

The square root of 28720552 is about 5359.1559036848. The cubic root of 28720552 is about 306.2416534168.

The spelling of 28720552 in words is "twenty-eight million, seven hundred twenty thousand, five hundred fifty-two".