80778671 has 16 divisors (see below), whose sum is σ = 86835840. Its totient is φ = 74921760.

The previous prime is 80778667. The next prime is 80778673. The reversal of 80778671 is 17687708.

It is a cyclic number.

It is not a de Polignac number, because 80778671 - 2² = 80778667 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80778673) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 285296 + ... + 285578.

It is an arithmetic number, because the mean of its divisors is an integer number (5427240).

Almost surely, 2^80778671 is an apocalyptic number.

80778671 is a deficient number, since it is larger than the sum of its proper divisors (6057169).

80778671 is a wasteful number, since it uses less digits than its factorization.

80778671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566.

The product of its (nonzero) digits is 131712, while the sum is 44.

The square root of 80778671 is about 8987.6955333389. The cubic root of 80778671 is about 432.2804231400.

The spelling of 80778671 in words is "eighty million, seven hundred seventy-eight thousand, six hundred seventy-one".