79378643 has 4 divisors (see below), whose sum is σ = 79414920. Its totient is φ = 79342368.

The previous prime is 79378633. The next prime is 79378657. The reversal of 79378643 is 34687397.

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: 34687397 = 109 ⋅318233.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79378643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79378603) 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, 14630 + ... + 19307.

It is an arithmetic number, because the mean of its divisors is an integer number (19853730).

Almost surely, 2^79378643 is an apocalyptic number.

79378643 is a deficient number, since it is larger than the sum of its proper divisors (36277).

79378643 is a wasteful number, since it uses less digits than its factorization.

79378643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36276.

The product of its digits is 762048, while the sum is 47.

The square root of 79378643 is about 8909.4692883471. The cubic root of 79378643 is about 429.7684764094.

The spelling of 79378643 in words is "seventy-nine million, three hundred seventy-eight thousand, six hundred forty-three".