78649343 has 4 divisors (see below), whose sum is σ = 78670320. Its totient is φ = 78628368.

The previous prime is 78649339. The next prime is 78649367. The reversal of 78649343 is 34394687.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34394687 = 103 ⋅333929.

It is a cyclic number.

It is not a de Polignac number, because 78649343 - 2² = 78649339 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78649294 and 78649303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78649393) 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, 3155 + ... + 12932.

It is an arithmetic number, because the mean of its divisors is an integer number (19667580).

Almost surely, 2^78649343 is an apocalyptic number.

78649343 is a deficient number, since it is larger than the sum of its proper divisors (20977).

78649343 is a wasteful number, since it uses less digits than its factorization.

78649343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20976.

The product of its digits is 435456, while the sum is 44.

The square root of 78649343 is about 8868.4464817689. The cubic root of 78649343 is about 428.4482431620.

The spelling of 78649343 in words is "seventy-eight million, six hundred forty-nine thousand, three hundred forty-three".