28532736 has 140 divisors (see below), whose sum is σ = 87223092. Its totient is φ = 9289728.

The previous prime is 28532731. The next prime is 28532747. The reversal of 28532736 is 63723582.

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

Its product of digits (60480) is a multiple of the sum of its prime divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 28532736.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28532731) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 663531 + ... + 663573.

Almost surely, 2^28532736 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 28532736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43611546).

28532736 is an abundant number, since it is smaller than the sum of its proper divisors (58690356).

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

28532736 is an frugal number, since it uses more digits than its factorization.

28532736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81 (or 48 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 28532736 is about 5341.6042534055. The cubic root of 28532736 is about 305.5726445000.

The spelling of 28532736 in words is "twenty-eight million, five hundred thirty-two thousand, seven hundred thirty-six".