28020972 has 96 divisors (see below), whose sum is σ = 79905280. Its totient is φ = 7464960.

The previous prime is 28020961. The next prime is 28020973. The reversal of 28020972 is 27902082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28020973) 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 in 31 ways as a sum of consecutive naturals, for example, 154722 + ... + 154902.

Almost surely, 2^28020972 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28020972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39952640).

28020972 is an abundant number, since it is smaller than the sum of its proper divisors (51884308).

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

28020972 is a wasteful number, since it uses less digits than its factorization.

28020972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311 (or 309 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 28020972 is about 5293.4839189328. The cubic root of 28020972 is about 303.7346917720.

The spelling of 28020972 in words is "twenty-eight million, twenty thousand, nine hundred seventy-two".