80784891 has 16 divisors (see below), whose sum is σ = 130561920. Its totient is φ = 48960360.

The previous prime is 80784889. The next prime is 80784931. The reversal of 80784891 is 19848708.

It is not a de Polignac number, because 80784891 - 2¹ = 80784889 is a prime.

It is a super-2 number, since 2×80784891² = 13052397227763762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (80784841) 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, 135705 + ... + 136298.

It is an arithmetic number, because the mean of its divisors is an integer number (8160120).

Almost surely, 2^80784891 is an apocalyptic number.

80784891 is a deficient number, since it is larger than the sum of its proper divisors (49777029).

80784891 is a wasteful number, since it uses less digits than its factorization.

80784891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272023 (or 272017 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 80784891 is about 8988.0415553111. The cubic root of 80784891 is about 432.2915181282.

The spelling of 80784891 in words is "eighty million, seven hundred eighty-four thousand, eight hundred ninety-one".