28987758 has 12 divisors (see below), whose sum is σ = 62806848. Its totient is φ = 9662580.

The previous prime is 28987747. The next prime is 28987769. The reversal of 28987758 is 85778982.

It is an interprime number because it is at equal distance from previous prime (28987747) and next prime (28987769).

It is a super-2 number, since 2×28987758² = 1680580227733128, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 805198 + ... + 805233.

It is an arithmetic number, because the mean of its divisors is an integer number (5233904).

Almost surely, 2^28987758 is an apocalyptic number.

28987758 is an abundant number, since it is smaller than the sum of its proper divisors (33819090).

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

28987758 is a wasteful number, since it uses less digits than its factorization.

28987758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1610439 (or 1610436 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 54.

The square root of 28987758 is about 5384.0280459894. The cubic root of 28987758 is about 307.1884451017.

The spelling of 28987758 in words is "twenty-eight million, nine hundred eighty-seven thousand, seven hundred fifty-eight".