28428778 has 8 divisors (see below), whose sum is σ = 48735072. Its totient is φ = 12183756.

The previous prime is 28428761. The next prime is 28428779. The reversal of 28428778 is 87782482.

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

It is not an unprimeable number, because it can be changed into a prime (28428779) 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, 1015300 + ... + 1015327.

It is an arithmetic number, because the mean of its divisors is an integer number (6091884).

Almost surely, 2^28428778 is an apocalyptic number.

28428778 is a deficient number, since it is larger than the sum of its proper divisors (20306294).

28428778 is a wasteful number, since it uses less digits than its factorization.

28428778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2030636.

The product of its digits is 401408, while the sum is 46.

The square root of 28428778 is about 5331.8644018767. The cubic root of 28428778 is about 305.2010785490.

The spelling of 28428778 in words is "twenty-eight million, four hundred twenty-eight thousand, seven hundred seventy-eight".