28430078 has 4 divisors (see below), whose sum is σ = 42645120. Its totient is φ = 14215038.

The previous prime is 28430029. The next prime is 28430089. The reversal of 28430078 is 87003482.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7107518 + ... + 7107521.

It is an arithmetic number, because the mean of its divisors is an integer number (10661280).

Almost surely, 2^28430078 is an apocalyptic number.

28430078 is a deficient number, since it is larger than the sum of its proper divisors (14215042).

28430078 is a wasteful number, since it uses less digits than its factorization.

28430078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14215041.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 28430078 is about 5331.9863090597. The cubic root of 28430078 is about 305.2057305880.

The spelling of 28430078 in words is "twenty-eight million, four hundred thirty thousand, seventy-eight".