28156346 has 4 divisors (see below), whose sum is σ = 42234522. Its totient is φ = 14078172.

The previous prime is 28156343. The next prime is 28156363. The reversal of 28156346 is 64365182.

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., 16900321 + 11256025 = 4111^2 + 3355^2 .

It is not an unprimeable number, because it can be changed into a prime (28156343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7039085 + ... + 7039088.

Almost surely, 2^28156346 is an apocalyptic number.

28156346 is a deficient number, since it is larger than the sum of its proper divisors (14078176).

28156346 is a wasteful number, since it uses less digits than its factorization.

28156346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14078175.

The product of its digits is 34560, while the sum is 35.

The square root of 28156346 is about 5306.2553651327. The cubic root of 28156346 is about 304.2230372119.

The spelling of 28156346 in words is "twenty-eight million, one hundred fifty-six thousand, three hundred forty-six".