28389346 has 4 divisors (see below), whose sum is σ = 42584022. Its totient is φ = 14194672.

The previous prime is 28389341. The next prime is 28389349. The reversal of 28389346 is 64398382.

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., 27092025 + 1297321 = 5205^2 + 1139^2 .

It is not an unprimeable number, because it can be changed into a prime (28389341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7097335 + ... + 7097338.

Almost surely, 2^28389346 is an apocalyptic number.

28389346 is a deficient number, since it is larger than the sum of its proper divisors (14194676).

28389346 is a wasteful number, since it uses less digits than its factorization.

28389346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14194675.

The product of its digits is 248832, while the sum is 43.

The square root of 28389346 is about 5328.1653502871. The cubic root of 28389346 is about 305.0599040269.

The spelling of 28389346 in words is "twenty-eight million, three hundred eighty-nine thousand, three hundred forty-six".