28740744 has 80 divisors (see below), whose sum is σ = 85268700. Its totient is φ = 9013248.

The previous prime is 28740743. The next prime is 28740773. The reversal of 28740744 is 44704782.

It can be written as a sum of positive squares in 2 ways, for example, as 28196100 + 544644 = 5310^2 + 738^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 28740699 and 28740708.

It is not an unprimeable number, because it can be changed into a prime (28740743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9712 + ... + 12320.

Almost surely, 2^28740744 is an apocalyptic number.

28740744 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 28740744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42634350).

28740744 is an abundant number, since it is smaller than the sum of its proper divisors (56527956).

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

28740744 is a wasteful number, since it uses less digits than its factorization.

28740744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2644 (or 2631 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 36.

The square root of 28740744 is about 5361.0394514497. The cubic root of 28740744 is about 306.3134043927.

The spelling of 28740744 in words is "twenty-eight million, seven hundred forty thousand, seven hundred forty-four".