28931072 has 44 divisors (see below), whose sum is σ = 60918720. Its totient is φ = 13694976.

The previous prime is 28931047. The next prime is 28931081. The reversal of 28931072 is 27013982.

It is a hoax number, since the sum of its digits (32) 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 (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18713 + ... + 20199.

Almost surely, 2^28931072 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 28931072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30459360).

28931072 is an abundant number, since it is smaller than the sum of its proper divisors (31987648).

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

28931072 is a wasteful number, since it uses less digits than its factorization.

28931072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1526 (or 1508 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 28931072 is about 5378.7611956658. The cubic root of 28931072 is about 306.9880772177.

The spelling of 28931072 in words is "twenty-eight million, nine hundred thirty-one thousand, seventy-two".