28429946 has 4 divisors (see below), whose sum is σ = 42644922. Its totient is φ = 14214972.

The previous prime is 28429943. The next prime is 28429963. The reversal of 28429946 is 64992482.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64992482 = 2 ⋅32496241.

It can be written as a sum of positive squares in only one way, i.e., 25150225 + 3279721 = 5015^2 + 1811^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28429897 and 28429906.

It is not an unprimeable number, because it can be changed into a prime (28429943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7107485 + ... + 7107488.

Almost surely, 2^28429946 is an apocalyptic number.

28429946 is a deficient number, since it is larger than the sum of its proper divisors (14214976).

28429946 is a wasteful number, since it uses less digits than its factorization.

28429946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14214975.

The product of its digits is 248832, while the sum is 44.

The square root of 28429946 is about 5331.9739309190. The cubic root of 28429946 is about 305.2052582336.

The spelling of 28429946 in words is "twenty-eight million, four hundred twenty-nine thousand, nine hundred forty-six".