78644543 has 4 divisors (see below), whose sum is σ = 78676800. Its totient is φ = 78612288.

The previous prime is 78644539. The next prime is 78644557. The reversal of 78644543 is 34544687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34544687 = 137 ⋅252151.

It is a cyclic number.

It is not a de Polignac number, because 78644543 - 2² = 78644539 is a prime.

It is a Duffinian number.

78644543 is a Rhonda number in base 10.

Its product of digits (322560) is a multiple of the sum of its prime divisors (32256).

It is a self number, because there is not a number n which added to its sum of digits gives 78644543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78644563) 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, 12143 + ... + 17456.

It is an arithmetic number, because the mean of its divisors is an integer number (19669200).

Almost surely, 2^78644543 is an apocalyptic number.

78644543 is a deficient number, since it is larger than the sum of its proper divisors (32257).

78644543 is a wasteful number, since it uses less digits than its factorization.

78644543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32256.

The product of its digits is 322560, while the sum is 41.

The square root of 78644543 is about 8868.1758552703. The cubic root of 78644543 is about 428.4395268637.

The spelling of 78644543 in words is "seventy-eight million, six hundred forty-four thousand, five hundred forty-three".