80491638 has 16 divisors (see below), whose sum is σ = 169456320. Its totient is φ = 25418376.

The previous prime is 80491637. The next prime is 80491643. The reversal of 80491638 is 83619408.

It is a junction number, because it is equal to n+sod(n) for n = 80491596 and 80491605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80491633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 352920 + ... + 353147.

It is an arithmetic number, because the mean of its divisors is an integer number (10591020).

Almost surely, 2^80491638 is an apocalyptic number.

80491638 is an abundant number, since it is smaller than the sum of its proper divisors (88964682).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

80491638 is a wasteful number, since it uses less digits than its factorization.

80491638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706091.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 80491638 is about 8971.7132143198. The cubic root of 80491638 is about 431.7678043176.

The spelling of 80491638 in words is "eighty million, four hundred ninety-one thousand, six hundred thirty-eight".