28888778 has 8 divisors (see below), whose sum is σ = 45613920. Its totient is φ = 13684140.

The previous prime is 28888771. The next prime is 28888841. The reversal of 28888778 is 87788882.

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

It is a super-2 number, since 2×28888778² = 1669122988666568, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28888771) 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, 380078 + ... + 380153.

It is an arithmetic number, because the mean of its divisors is an integer number (5701740).

Almost surely, 2^28888778 is an apocalyptic number.

28888778 is a deficient number, since it is larger than the sum of its proper divisors (16725142).

28888778 is a wasteful number, since it uses less digits than its factorization.

28888778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760252.

The product of its digits is 3211264, while the sum is 56.

The square root of 28888778 is about 5374.8281833004. The cubic root of 28888778 is about 306.8384101537.

The spelling of 28888778 in words is "twenty-eight million, eight hundred eighty-eight thousand, seven hundred seventy-eight".