28878554 has 8 divisors (see below), whose sum is σ = 43491168. Its totient is φ = 14381500.

The previous prime is 28878533. The next prime is 28878571. The reversal of 28878554 is 45587882.

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

It is a super-2 number, since 2×28878554² = 1667941762261832, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28878499 and 28878508.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28262 + ... + 29265.

It is an arithmetic number, because the mean of its divisors is an integer number (5436396).

Almost surely, 2^28878554 is an apocalyptic number.

28878554 is a deficient number, since it is larger than the sum of its proper divisors (14612614).

28878554 is a wasteful number, since it uses less digits than its factorization.

28878554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57780.

The product of its digits is 716800, while the sum is 47.

The square root of 28878554 is about 5373.8769989645. The cubic root of 28878554 is about 306.8022082525.

The spelling of 28878554 in words is "twenty-eight million, eight hundred seventy-eight thousand, five hundred fifty-four".