80678947 has 4 divisors (see below), whose sum is σ = 81040960. Its totient is φ = 80316936.

The previous prime is 80678929. The next prime is 80678951. The reversal of 80678947 is 74987608.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80678947 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 80678947.

It is not an unprimeable number, because it can be changed into a prime (80678977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180672 + ... + 181117.

It is an arithmetic number, because the mean of its divisors is an integer number (20260240).

Almost surely, 2^80678947 is an apocalyptic number.

80678947 is a deficient number, since it is larger than the sum of its proper divisors (362013).

80678947 is a wasteful number, since it uses less digits than its factorization.

80678947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362012.

The product of its (nonzero) digits is 677376, while the sum is 49.

The square root of 80678947 is about 8982.1460130639. The cubic root of 80678947 is about 432.1024616216.

The spelling of 80678947 in words is "eighty million, six hundred seventy-eight thousand, nine hundred forty-seven".