28724064 has 36 divisors (see below), whose sum is σ = 75538764. Its totient is φ = 9557184.

The previous prime is 28724053. The next prime is 28724081. The reversal of 28724064 is 46042782.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52239 + ... + 52785.

It is an arithmetic number, because the mean of its divisors is an integer number (2098299).

Almost surely, 2^28724064 is an apocalyptic number.

28724064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28724064 is an abundant number, since it is smaller than the sum of its proper divisors (46814700).

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

28724064 is an frugal number, since it uses more digits than its factorization.

28724064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107 (or 552 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 33.

The square root of 28724064 is about 5359.4835572096. The cubic root of 28724064 is about 306.2541354988.

The spelling of 28724064 in words is "twenty-eight million, seven hundred twenty-four thousand, sixty-four".