28878405 has 8 divisors (see below), whose sum is σ = 46205472. Its totient is φ = 15401808.

The previous prime is 28878401. The next prime is 28878433. The reversal of 28878405 is 50487882.

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

It is not a de Polignac number, because 28878405 - 2² = 28878401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28878401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 962599 + ... + 962628.

It is an arithmetic number, because the mean of its divisors is an integer number (5775684).

Almost surely, 2^28878405 is an apocalyptic number.

It is an amenable number.

28878405 is a deficient number, since it is larger than the sum of its proper divisors (17327067).

28878405 is a wasteful number, since it uses less digits than its factorization.

28878405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1925235.

The product of its (nonzero) digits is 143360, while the sum is 42.

The square root of 28878405 is about 5373.8631355851. The cubic root of 28878405 is about 306.8016805990.

The spelling of 28878405 in words is "twenty-eight million, eight hundred seventy-eight thousand, four hundred five".