289163778 has 16 divisors (see below), whose sum is σ = 612347040. Its totient is φ = 90718016.

The previous prime is 289163773. The next prime is 289163789. The reversal of 289163778 is 877361982.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 289163778.

It is not an unprimeable number, because it can be changed into a prime (289163773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1417368 + ... + 1417571.

It is an arithmetic number, because the mean of its divisors is an integer number (38271690).

Almost surely, 2^289163778 is an apocalyptic number.

289163778 is an abundant number, since it is smaller than the sum of its proper divisors (323183262).

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

289163778 is a wasteful number, since it uses less digits than its factorization.

289163778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2834961.

The product of its digits is 1016064, while the sum is 51.

The square root of 289163778 is about 17004.8163177377. The cubic root of 289163778 is about 661.2737705847.

It can be divided in two parts, 289163 and 778, that added together give a triangular number (289941 = T₇₆₁).

The spelling of 289163778 in words is "two hundred eighty-nine million, one hundred sixty-three thousand, seven hundred seventy-eight".