28723572 has 72 divisors (see below), whose sum is σ = 77968800. Its totient is φ = 9235296.

The previous prime is 28723559. The next prime is 28723609. The reversal of 28723572 is 27532782.

It is a happy number.

28723572 is a `hidden beast` number, since 2 + 87 + 2 + 3 + 572 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27679 + ... + 28697.

It is an arithmetic number, because the mean of its divisors is an integer number (1082900).

Almost surely, 2^28723572 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28723572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38984400).

28723572 is an abundant number, since it is smaller than the sum of its proper divisors (49245228).

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

28723572 is a wasteful number, since it uses less digits than its factorization.

28723572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1067 (or 1053 counting only the distinct ones).

The product of its digits is 47040, while the sum is 36.

The square root of 28723572 is about 5359.4376570681. The cubic root of 28723572 is about 306.2523869313.

The spelling of 28723572 in words is "twenty-eight million, seven hundred twenty-three thousand, five hundred seventy-two".