28887947 has 16 divisors (see below), whose sum is σ = 33558624. Its totient is φ = 24576000.

The previous prime is 28887941. The next prime is 28887979. The reversal of 28887947 is 74978882.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28887947 - 2¹² = 28883851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28887941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44747 + ... + 45387.

It is an arithmetic number, because the mean of its divisors is an integer number (2097414).

Almost surely, 2^28887947 is an apocalyptic number.

28887947 is a deficient number, since it is larger than the sum of its proper divisors (4670677).

28887947 is a wasteful number, since it uses less digits than its factorization.

28887947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910.

The product of its digits is 1806336, while the sum is 53.

The square root of 28887947 is about 5374.7508779477. The cubic root of 28887947 is about 306.8354680059.

The spelling of 28887947 in words is "twenty-eight million, eight hundred eighty-seven thousand, nine hundred forty-seven".