78964289 has 4 divisors (see below), whose sum is σ = 78984624. Its totient is φ = 78943956.

The previous prime is 78964273. The next prime is 78964309. The reversal of 78964289 is 98246987.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78964289 - 2⁴ = 78964273 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78964289.

It is not an unprimeable number, because it can be changed into a prime (78964489) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2327 + ... + 12780.

It is an arithmetic number, because the mean of its divisors is an integer number (19746156).

Almost surely, 2^78964289 is an apocalyptic number.

It is an amenable number.

78964289 is a deficient number, since it is larger than the sum of its proper divisors (20335).

78964289 is a wasteful number, since it uses less digits than its factorization.

78964289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20334.

The product of its digits is 1741824, while the sum is 53.

The square root of 78964289 is about 8886.1852895379. The cubic root of 78964289 is about 429.0193788643.

The spelling of 78964289 in words is "seventy-eight million, nine hundred sixty-four thousand, two hundred eighty-nine".