28661996 has 18 divisors (see below), whose sum is σ = 55133820. Its totient is φ = 13027960.

The previous prime is 28661981. The next prime is 28661999. The reversal of 28661996 is 69916682.

It is a self number, because there is not a number n which added to its sum of digits gives 28661996.

It is not an unprimeable number, because it can be changed into a prime (28661999) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29126 + ... + 30093.

It is an arithmetic number, because the mean of its divisors is an integer number (3062990).

Almost surely, 2^28661996 is an apocalyptic number.

It is an amenable number.

28661996 is a deficient number, since it is larger than the sum of its proper divisors (26471824).

28661996 is a wasteful number, since it uses less digits than its factorization.

28661996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59245 (or 59232 counting only the distinct ones).

The product of its digits is 279936, while the sum is 47.

The square root of 28661996 is about 5353.6899424602. The cubic root of 28661996 is about 306.0333880723.

The spelling of 28661996 in words is "twenty-eight million, six hundred sixty-one thousand, nine hundred ninety-six".