28655434 has 4 divisors (see below), whose sum is σ = 42983154. Its totient is φ = 14327716.

The previous prime is 28655413. The next prime is 28655437. The reversal of 28655434 is 43455682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43455682 = 2 ⋅21727841.

It can be written as a sum of positive squares in only one way, i.e., 28590409 + 65025 = 5347^2 + 255^2 .

It is a super-2 number, since 2×28655434² = 1642267795456712, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28655393 and 28655402.

It is not an unprimeable number, because it can be changed into a prime (28655437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7163857 + ... + 7163860.

Almost surely, 2^28655434 is an apocalyptic number.

28655434 is a deficient number, since it is larger than the sum of its proper divisors (14327720).

28655434 is a wasteful number, since it uses less digits than its factorization.

28655434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14327719.

The product of its digits is 115200, while the sum is 37.

The square root of 28655434 is about 5353.0770590381. The cubic root of 28655434 is about 306.0100314253.

The spelling of 28655434 in words is "twenty-eight million, six hundred fifty-five thousand, four hundred thirty-four".