28513972 has 6 divisors (see below), whose sum is σ = 49899458. Its totient is φ = 14256984.

The previous prime is 28513963. The next prime is 28513973. The reversal of 28513972 is 27931582.

It can be written as a sum of positive squares in only one way, i.e., 27815076 + 698896 = 5274^2 + 836^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28513973) by changing a digit.

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 as a sum of consecutive naturals, namely, 3564243 + ... + 3564250.

Almost surely, 2^28513972 is an apocalyptic number.

It is an amenable number.

28513972 is a deficient number, since it is larger than the sum of its proper divisors (21385486).

28513972 is a wasteful number, since it uses less digits than its factorization.

28513972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7128497 (or 7128495 counting only the distinct ones).

The product of its digits is 30240, while the sum is 37.

The square root of 28513972 is about 5339.8475633673. The cubic root of 28513972 is about 305.5056451715.

The spelling of 28513972 in words is "twenty-eight million, five hundred thirteen thousand, nine hundred seventy-two".