28689655 has 8 divisors (see below), whose sum is σ = 34691184. Its totient is φ = 22776000.

The previous prime is 28689649. The next prime is 28689667. The reversal of 28689655 is 55698682.

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

It is not a de Polignac number, because 28689655 - 2⁵ = 28689623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28689599 and 28689608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21246 + ... + 22555.

It is an arithmetic number, because the mean of its divisors is an integer number (4336398).

Almost surely, 2^28689655 is an apocalyptic number.

28689655 is a deficient number, since it is larger than the sum of its proper divisors (6001529).

28689655 is a wasteful number, since it uses less digits than its factorization.

28689655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43937.

The product of its digits is 1036800, while the sum is 49.

The square root of 28689655 is about 5356.2724912013. The cubic root of 28689655 is about 306.1317977824.

The spelling of 28689655 in words is "twenty-eight million, six hundred eighty-nine thousand, six hundred fifty-five".