28753740 has 72 divisors (see below), whose sum is σ = 90050688. Its totient is φ = 7418880.

The previous prime is 28753729. The next prime is 28753757. The reversal of 28753740 is 4735782.

28753740 is a `hidden beast` number, since 2 + 87 + 537 + 40 = 666.

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 = 28753695 and 28753704.

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, 3004 + ... + 8156.

It is an arithmetic number, because the mean of its divisors is an integer number (1250704).

Almost surely, 2^28753740 is an apocalyptic number.

28753740 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 28753740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45025344).

28753740 is an abundant number, since it is smaller than the sum of its proper divisors (61296948).

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

28753740 is a wasteful number, since it uses less digits than its factorization.

28753740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5199 (or 5194 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

The square root of 28753740 is about 5362.2513928386. The cubic root of 28753740 is about 306.3595670707.

The spelling of 28753740 in words is "twenty-eight million, seven hundred fifty-three thousand, seven hundred forty".