28878646 has 8 divisors (see below), whose sum is σ = 43764840. Its totient is φ = 14290368.

The previous prime is 28878643. The next prime is 28878653. The reversal of 28878646 is 64687882.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28878646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28878643) 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, 74236 + ... + 74623.

It is an arithmetic number, because the mean of its divisors is an integer number (5470605).

Almost surely, 2^28878646 is an apocalyptic number.

28878646 is a deficient number, since it is larger than the sum of its proper divisors (14886194).

28878646 is a wasteful number, since it uses less digits than its factorization.

28878646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148958.

The product of its digits is 1032192, while the sum is 49.

The square root of 28878646 is about 5373.8855588857. The cubic root of 28878646 is about 306.8025340510.

The spelling of 28878646 in words is "twenty-eight million, eight hundred seventy-eight thousand, six hundred forty-six".