28978737 has 16 divisors (see below), whose sum is σ = 39547968. Its totient is φ = 18869760.

The previous prime is 28978723. The next prime is 28978739. The reversal of 28978737 is 73787982.

It is not a de Polignac number, because 28978737 - 2⁶ = 28978673 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28978737.

It is not an unprimeable number, because it can be changed into a prime (28978739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24162 + ... + 25332.

It is an arithmetic number, because the mean of its divisors is an integer number (2471748).

Almost surely, 2^28978737 is an apocalyptic number.

It is an amenable number.

28978737 is a deficient number, since it is larger than the sum of its proper divisors (10569231).

28978737 is a wasteful number, since it uses less digits than its factorization.

28978737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1360.

The product of its digits is 1185408, while the sum is 51.

The square root of 28978737 is about 5383.1902251360. The cubic root of 28978737 is about 307.1565760799.

The spelling of 28978737 in words is "twenty-eight million, nine hundred seventy-eight thousand, seven hundred thirty-seven".