28425434 has 4 divisors (see below), whose sum is σ = 42638154. Its totient is φ = 14212716.

The previous prime is 28425431. The next prime is 28425473. The reversal of 28425434 is 43452482.

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

It can be written as a sum of positive squares in only one way, i.e., 27931225 + 494209 = 5285^2 + 703^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28425434.

It is not an unprimeable number, because it can be changed into a prime (28425431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7106357 + ... + 7106360.

Almost surely, 2^28425434 is an apocalyptic number.

28425434 is a deficient number, since it is larger than the sum of its proper divisors (14212720).

28425434 is a wasteful number, since it uses less digits than its factorization.

28425434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14212719.

The product of its digits is 30720, while the sum is 32.

The square root of 28425434 is about 5331.5508062852. The cubic root of 28425434 is about 305.1891114216.

The spelling of 28425434 in words is "twenty-eight million, four hundred twenty-five thousand, four hundred thirty-four".