28947572 has 6 divisors (see below), whose sum is σ = 50658258. Its totient is φ = 14473784.

The previous prime is 28947563. The next prime is 28947577. The reversal of 28947572 is 27574982.

It can be written as a sum of positive squares in only one way, i.e., 27081616 + 1865956 = 5204^2 + 1366^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28947577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3618443 + ... + 3618450.

It is an arithmetic number, because the mean of its divisors is an integer number (8443043).

Almost surely, 2^28947572 is an apocalyptic number.

It is an amenable number.

28947572 is a deficient number, since it is larger than the sum of its proper divisors (21710686).

28947572 is a wasteful number, since it uses less digits than its factorization.

28947572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7236897 (or 7236895 counting only the distinct ones).

The product of its digits is 282240, while the sum is 44.

The square root of 28947572 is about 5380.2947874629. The cubic root of 28947572 is about 307.0464267163.

The spelling of 28947572 in words is "twenty-eight million, nine hundred forty-seven thousand, five hundred seventy-two".