28998664 has 8 divisors (see below), whose sum is σ = 54372510. Its totient is φ = 14499328.

The previous prime is 28998661. The next prime is 28998679. The reversal of 28998664 is 46689982.

It can be written as a sum of positive squares in only one way, i.e., 25908100 + 3090564 = 5090^2 + 1758^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (28998661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1812409 + ... + 1812424.

Almost surely, 2^28998664 is an apocalyptic number.

It is an amenable number.

28998664 is a deficient number, since it is larger than the sum of its proper divisors (25373846).

28998664 is a wasteful number, since it uses less digits than its factorization.

28998664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3624839 (or 3624835 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 52.

The square root of 28998664 is about 5385.0407612199. The cubic root of 28998664 is about 307.2269645475.

The spelling of 28998664 in words is "twenty-eight million, nine hundred ninety-eight thousand, six hundred sixty-four".