289728978 has 32 divisors (see below), whose sum is σ = 722442240. Its totient is φ = 75254160.

The previous prime is 289728973. The next prime is 289728983. The reversal of 289728978 is 879827982.

It is an interprime number because it is at equal distance from previous prime (289728973) and next prime (289728983).

It is not an unprimeable number, because it can be changed into a prime (289728973) 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, 313098 + ... + 314021.

It is an arithmetic number, because the mean of its divisors is an integer number (22576320).

Almost surely, 2^289728978 is an apocalyptic number.

289728978 is an abundant number, since it is smaller than the sum of its proper divisors (432713262).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

289728978 is a wasteful number, since it uses less digits than its factorization.

289728978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627142.

The product of its digits is 8128512, while the sum is 60.

The square root of 289728978 is about 17021.4270259576. The cubic root of 289728978 is about 661.7043324504.

It can be divided in two parts, 28972 and 8978, that added together give a triangular number (37950 = T₂₇₅).

The spelling of 289728978 in words is "two hundred eighty-nine million, seven hundred twenty-eight thousand, nine hundred seventy-eight".