28787538 has 16 divisors (see below), whose sum is σ = 62004096. Its totient is φ = 8857680.

The previous prime is 28787519. The next prime is 28787557. The reversal of 28787538 is 83578782.

It is an interprime number because it is at equal distance from previous prime (28787519) and next prime (28787557).

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 7 ways as a sum of consecutive naturals, for example, 184458 + ... + 184613.

It is an arithmetic number, because the mean of its divisors is an integer number (3875256).

Almost surely, 2^28787538 is an apocalyptic number.

28787538 is an abundant number, since it is smaller than the sum of its proper divisors (33216558).

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

28787538 is a wasteful number, since it uses less digits than its factorization.

28787538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369089.

The product of its digits is 752640, while the sum is 48.

The square root of 28787538 is about 5365.4019420729. The cubic root of 28787538 is about 306.4795547820.

The spelling of 28787538 in words is "twenty-eight million, seven hundred eighty-seven thousand, five hundred thirty-eight".