78644293 has 8 divisors (see below), whose sum is σ = 96793088. Its totient is φ = 62223984.

The previous prime is 78644281. The next prime is 78644323. The reversal of 78644293 is 39244687.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78644293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78642293) 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, 432021 + ... + 432202.

It is an arithmetic number, because the mean of its divisors is an integer number (12099136).

Almost surely, 2^78644293 is an apocalyptic number.

It is an amenable number.

78644293 is a deficient number, since it is larger than the sum of its proper divisors (18148795).

78644293 is a wasteful number, since it uses less digits than its factorization.

78644293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864243.

The product of its digits is 290304, while the sum is 43.

The square root of 78644293 is about 8868.1617599139. The cubic root of 78644293 is about 428.4390728801.

The spelling of 78644293 in words is "seventy-eight million, six hundred forty-four thousand, two hundred ninety-three".