28757040 has 120 divisors (see below), whose sum is σ = 96667920. Its totient is φ = 7068672.

The previous prime is 28757039. The next prime is 28757063. The reversal of 28757040 is 4075782.

It is a tau number, because it is divible by the number of its divisors (120).

It is a junction number, because it is equal to n+sod(n) for n = 28756992 and 28757010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40206 + ... + 40914.

It is an arithmetic number, because the mean of its divisors is an integer number (805566).

Almost surely, 2^28757040 is an apocalyptic number.

28757040 is a gapful number since it is divisible by the number (20) 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 28757040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48333960).

28757040 is an abundant number, since it is smaller than the sum of its proper divisors (67910880).

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

28757040 is a wasteful number, since it uses less digits than its factorization.

28757040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751 (or 732 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 28757040 is about 5362.5590905835. The cubic root of 28757040 is about 306.3712866812.

The spelling of 28757040 in words is "twenty-eight million, seven hundred fifty-seven thousand, forty".