28772324 has 48 divisors (see below), whose sum is σ = 59947776. Its totient is φ = 11827200.

The previous prime is 28772323. The next prime is 28772339. The reversal of 28772324 is 42327782.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28772323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81332 + ... + 81684.

It is an arithmetic number, because the mean of its divisors is an integer number (1248912).

Almost surely, 2^28772324 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 28772324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29973888).

28772324 is an abundant number, since it is smaller than the sum of its proper divisors (31175452).

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

28772324 is a wasteful number, since it uses less digits than its factorization.

28772324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476 (or 474 counting only the distinct ones).

The product of its digits is 37632, while the sum is 35.

The square root of 28772324 is about 5363.9839671647. The cubic root of 28772324 is about 306.4255545452.

The spelling of 28772324 in words is "twenty-eight million, seven hundred seventy-two thousand, three hundred twenty-four".