28738520 has 16 divisors (see below), whose sum is σ = 64661760. Its totient is φ = 11495392.

The previous prime is 28738513. The next prime is 28738537. The reversal of 28738520 is 2583782.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359192 + ... + 359271.

It is an arithmetic number, because the mean of its divisors is an integer number (4041360).

Almost surely, 2^28738520 is an apocalyptic number.

28738520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28738520 is an abundant number, since it is smaller than the sum of its proper divisors (35923240).

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

28738520 is a wasteful number, since it uses less digits than its factorization.

28738520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718474 (or 718470 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 28738520 is about 5360.8320249752. The cubic root of 28738520 is about 306.3055031986.

The spelling of 28738520 in words is "twenty-eight million, seven hundred thirty-eight thousand, five hundred twenty".