28669636 has 6 divisors (see below), whose sum is σ = 50171870. Its totient is φ = 14334816.

The previous prime is 28669591. The next prime is 28669639. The reversal of 28669636 is 63696682.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 28302400 + 367236 = 5320^2 + 606^2 .

It is not an unprimeable number, because it can be changed into a prime (28669639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3583701 + ... + 3583708.

Almost surely, 2^28669636 is an apocalyptic number.

It is an amenable number.

28669636 is a deficient number, since it is larger than the sum of its proper divisors (21502234).

28669636 is a wasteful number, since it uses less digits than its factorization.

28669636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7167413 (or 7167411 counting only the distinct ones).

The product of its digits is 559872, while the sum is 46.

The square root of 28669636 is about 5354.4034214840. The cubic root of 28669636 is about 306.0605772391.

The spelling of 28669636 in words is "twenty-eight million, six hundred sixty-nine thousand, six hundred thirty-six".