28773072 has 30 divisors (see below), whose sum is σ = 80525042. Its totient is φ = 9590976.

The previous prime is 28773067. The next prime is 28773079. The reversal of 28773072 is 27037782.

It can be written as a sum of positive squares in only one way, i.e., 28772496 + 576 = 5364^2 + 24^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28773079) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 99763 + ... + 100050.

Almost surely, 2^28773072 is an apocalyptic number.

It is an amenable number.

28773072 is an abundant number, since it is smaller than the sum of its proper divisors (51751970).

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

28773072 is a wasteful number, since it uses less digits than its factorization.

28773072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199827 (or 199818 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 36.

The square root of 28773072 is about 5364.0536910065. The cubic root of 28773072 is about 306.4282099248.

The spelling of 28773072 in words is "twenty-eight million, seven hundred seventy-three thousand, seventy-two".