28072064 has 16 divisors (see below), whose sum is σ = 55925070. Its totient is φ = 14035968.

The previous prime is 28072061. The next prime is 28072069. The reversal of 28072064 is 46027082.

It can be written as a sum of positive squares in only one way, i.e., 15054400 + 13017664 = 3880^2 + 3608^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (28072061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109529 + ... + 109784.

Almost surely, 2^28072064 is an apocalyptic number.

It is an amenable number.

28072064 is a deficient number, since it is larger than the sum of its proper divisors (27853006).

28072064 is an equidigital number, since it uses as much as digits as its factorization.

28072064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219327 (or 219315 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 28072064 is about 5298.3076543364. The cubic root of 28072064 is about 303.9191844273.

The spelling of 28072064 in words is "twenty-eight million, seventy-two thousand, sixty-four".