28478798 has 4 divisors (see below), whose sum is σ = 42718200. Its totient is φ = 14239398.

The previous prime is 28478797. The next prime is 28478803. The reversal of 28478798 is 89787482.

It is a happy number.

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

It is a super-2 number, since 2×28478798² = 1622083871049608, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28478797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7119698 + ... + 7119701.

It is an arithmetic number, because the mean of its divisors is an integer number (10679550).

Almost surely, 2^28478798 is an apocalyptic number.

28478798 is a deficient number, since it is larger than the sum of its proper divisors (14239402).

28478798 is a wasteful number, since it uses less digits than its factorization.

28478798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14239401.

The product of its digits is 1806336, while the sum is 53.

The square root of 28478798 is about 5336.5530073260. The cubic root of 28478798 is about 305.3799725458.

The spelling of 28478798 in words is "twenty-eight million, four hundred seventy-eight thousand, seven hundred ninety-eight".