28888478 has 4 divisors (see below), whose sum is σ = 43332720. Its totient is φ = 14444238.

The previous prime is 28888469. The next prime is 28888481. The reversal of 28888478 is 87488882.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×28888478² = 1669088322312968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7222118 + ... + 7222121.

It is an arithmetic number, because the mean of its divisors is an integer number (10833180).

Almost surely, 2^28888478 is an apocalyptic number.

28888478 is a deficient number, since it is larger than the sum of its proper divisors (14444242).

28888478 is a wasteful number, since it uses less digits than its factorization.

28888478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14444241.

The product of its digits is 1835008, while the sum is 53.

The square root of 28888478 is about 5374.8002753591. The cubic root of 28888478 is about 306.8373480130.

The spelling of 28888478 in words is "twenty-eight million, eight hundred eighty-eight thousand, four hundred seventy-eight".