28981895 has 8 divisors (see below), whose sum is σ = 34853760. Its totient is φ = 23135200.

The previous prime is 28981891. The next prime is 28981907. The reversal of 28981895 is 59818982.

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

It is not a de Polignac number, because 28981895 - 2² = 28981891 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28981891) 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, 3656 + ... + 8445.

It is an arithmetic number, because the mean of its divisors is an integer number (4356720).

Almost surely, 2^28981895 is an apocalyptic number.

28981895 is a deficient number, since it is larger than the sum of its proper divisors (5871865).

28981895 is a wasteful number, since it uses less digits than its factorization.

28981895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12585.

The product of its digits is 414720, while the sum is 50.

The square root of 28981895 is about 5383.4835376362. The cubic root of 28981895 is about 307.1677332861.

The spelling of 28981895 in words is "twenty-eight million, nine hundred eighty-one thousand, eight hundred ninety-five".