80978939 has 8 divisors (see below), whose sum is σ = 85821120. Its totient is φ = 76145536.

The previous prime is 80978927. The next prime is 80978941. The reversal of 80978939 is 93987908.

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

It is a cyclic number.

It is not a de Polignac number, because 80978939 - 2⁴ = 80978923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80978959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33917 + ... + 36225.

It is an arithmetic number, because the mean of its divisors is an integer number (10727640).

Almost surely, 2^80978939 is an apocalyptic number.

80978939 is a deficient number, since it is larger than the sum of its proper divisors (4842181).

80978939 is a wasteful number, since it uses less digits than its factorization.

80978939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4389.

The product of its (nonzero) digits is 979776, while the sum is 53.

The square root of 80978939 is about 8998.8298683773. The cubic root of 80978939 is about 432.6373675722.

The spelling of 80978939 in words is "eighty million, nine hundred seventy-eight thousand, nine hundred thirty-nine".