28615066 has 4 divisors (see below), whose sum is σ = 42922602. Its totient is φ = 14307532.

The previous prime is 28615061. The next prime is 28615087. The reversal of 28615066 is 66051682.

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., 20657025 + 7958041 = 4545^2 + 2821^2 .

It is not an unprimeable number, because it can be changed into a prime (28615061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7153765 + ... + 7153768.

Almost surely, 2^28615066 is an apocalyptic number.

28615066 is a deficient number, since it is larger than the sum of its proper divisors (14307536).

28615066 is a wasteful number, since it uses less digits than its factorization.

28615066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14307535.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 28615066 is about 5349.3051885268. The cubic root of 28615066 is about 305.8662679049.

The spelling of 28615066 in words is "twenty-eight million, six hundred fifteen thousand, sixty-six".