28546138 has 4 divisors (see below), whose sum is σ = 42819210. Its totient is φ = 14273068.

The previous prime is 28546123. The next prime is 28546153. The reversal of 28546138 is 83164582.

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: 83164582 = 2 ⋅41582291.

It is an interprime number because it is at equal distance from previous prime (28546123) and next prime (28546153).

It can be written as a sum of positive squares in only one way, i.e., 23648769 + 4897369 = 4863^2 + 2213^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28546097 and 28546106.

It is an unprimeable number.

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, 7136533 + ... + 7136536.

Almost surely, 2^28546138 is an apocalyptic number.

28546138 is a deficient number, since it is larger than the sum of its proper divisors (14273072).

28546138 is a wasteful number, since it uses less digits than its factorization.

28546138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14273071.

The product of its digits is 46080, while the sum is 37.

The square root of 28546138 is about 5342.8585981663. The cubic root of 28546138 is about 305.6204801224.

The spelling of 28546138 in words is "twenty-eight million, five hundred forty-six thousand, one hundred thirty-eight".