28000072 has 16 divisors (see below), whose sum is σ = 55263600. Its totient is φ = 13263120.

The previous prime is 28000069. The next prime is 28000073. The reversal of 28000072 is 27000082.

It is a super-3 number, since 3×28000072³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (28000073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91954 + ... + 92257.

It is an arithmetic number, because the mean of its divisors is an integer number (3453975).

Almost surely, 2^28000072 is an apocalyptic number.

It is an amenable number.

28000072 is a deficient number, since it is larger than the sum of its proper divisors (27263528).

28000072 is a wasteful number, since it uses less digits than its factorization.

28000072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184236 (or 184232 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 28000072 is about 5291.5094254853. The cubic root of 28000072 is about 303.6591574664.

The spelling of 28000072 in words is "twenty-eight million, seventy-two", and thus it is an aban number and an uban number.