28751072 has 48 divisors (see below), whose sum is σ = 66457440. Its totient is φ = 11985408.

The previous prime is 28751053. The next prime is 28751083. The reversal of 28751072 is 27015782.

It is a super-2 number, since 2×28751072² = 1653248282298368, which contains 22 as substring.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6554 + ... + 10022.

It is an arithmetic number, because the mean of its divisors is an integer number (1384530).

Almost surely, 2^28751072 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 28751072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33228720).

28751072 is an abundant number, since it is smaller than the sum of its proper divisors (37706368).

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

28751072 is a wasteful number, since it uses less digits than its factorization.

28751072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3523 (or 3515 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 28751072 is about 5362.0026109654. The cubic root of 28751072 is about 306.3500912876.

The spelling of 28751072 in words is "twenty-eight million, seven hundred fifty-one thousand, seventy-two".