28723824 has 60 divisors (see below), whose sum is σ = 80980432. Its totient is φ = 9504000.

The previous prime is 28723823. The next prime is 28723837. The reversal of 28723824 is 42832782.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28723823) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21084 + ... + 22404.

Almost surely, 2^28723824 is an apocalyptic number.

28723824 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28723824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40490216).

28723824 is an abundant number, since it is smaller than the sum of its proper divisors (52256608).

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

28723824 is a wasteful number, since it uses less digits than its factorization.

28723824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1486 (or 1477 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The square root of 28723824 is about 5359.4611669458. The cubic root of 28723824 is about 306.2532825415.

The spelling of 28723824 in words is "twenty-eight million, seven hundred twenty-three thousand, eight hundred twenty-four".