80978611 has 4 divisors (see below), whose sum is σ = 92546992. Its totient is φ = 69410232.

The previous prime is 80978609. The next prime is 80978617. The reversal of 80978611 is 11687908.

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

It is a cyclic number.

It is not a de Polignac number, because 80978611 - 2¹ = 80978609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80978617) 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, 5784180 + ... + 5784193.

It is an arithmetic number, because the mean of its divisors is an integer number (23136748).

Almost surely, 2^80978611 is an apocalyptic number.

80978611 is a deficient number, since it is larger than the sum of its proper divisors (11568381).

80978611 is a wasteful number, since it uses less digits than its factorization.

80978611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11568380.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 80978611 is about 8998.8116437672. The cubic root of 80978611 is about 432.6367834481.

The spelling of 80978611 in words is "eighty million, nine hundred seventy-eight thousand, six hundred eleven".