80826991 has 32 divisors (see below), whose sum is σ = 100270080. Its totient is φ = 63667296.

The previous prime is 80826937. The next prime is 80826997. The reversal of 80826991 is 19962808.

It is a happy number.

It is not a de Polignac number, because 80826991 - 2¹⁷ = 80695919 is a prime.

It is a super-2 number, since 2×80826991² = 13066004948228162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80826997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 636370 + ... + 636496.

It is an arithmetic number, because the mean of its divisors is an integer number (3133440).

Almost surely, 2^80826991 is an apocalyptic number.

80826991 is a deficient number, since it is larger than the sum of its proper divisors (19443089).

80826991 is a wasteful number, since it uses less digits than its factorization.

80826991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 80826991 is about 8990.3832510077. The cubic root of 80826991 is about 432.3665994631.

The spelling of 80826991 in words is "eighty million, eight hundred twenty-six thousand, nine hundred ninety-one".