28935987 has 4 divisors (see below), whose sum is σ = 38581320. Its totient is φ = 19290656.

The previous prime is 28935971. The next prime is 28936003. The reversal of 28935987 is 78953982.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (28935971) and next prime (28936003).

It is a cyclic number.

It is not a de Polignac number, because 28935987 - 2⁴ = 28935971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28935937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4822662 + ... + 4822667.

It is an arithmetic number, because the mean of its divisors is an integer number (9645330).

Almost surely, 2^28935987 is an apocalyptic number.

28935987 is a deficient number, since it is larger than the sum of its proper divisors (9645333).

28935987 is an equidigital number, since it uses as much as digits as its factorization.

28935987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9645332.

The product of its digits is 1088640, while the sum is 51.

The square root of 28935987 is about 5379.2180658531. The cubic root of 28935987 is about 307.0054606151.

The spelling of 28935987 in words is "twenty-eight million, nine hundred thirty-five thousand, nine hundred eighty-seven".