28935681 has 8 divisors (see below), whose sum is σ = 38618304. Its totient is φ = 19271760.

The previous prime is 28935661. The next prime is 28935701. The reversal of 28935681 is 18653982.

It is an interprime number because it is at equal distance from previous prime (28935661) and next prime (28935701).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28935681 - 2⁹ = 28935169 is a prime.

It is a super-2 number, since 2×28935681² = 1674547269867522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28935601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 541 + ... + 7626.

It is an arithmetic number, because the mean of its divisors is an integer number (4827288).

Almost surely, 2^28935681 is an apocalyptic number.

It is an amenable number.

28935681 is a deficient number, since it is larger than the sum of its proper divisors (9682623).

28935681 is a wasteful number, since it uses less digits than its factorization.

28935681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9351.

The product of its digits is 103680, while the sum is 42.

The square root of 28935681 is about 5379.1896229823. The cubic root of 28935681 is about 307.0043784102.

The spelling of 28935681 in words is "twenty-eight million, nine hundred thirty-five thousand, six hundred eighty-one".