80649081 has 16 divisors (see below), whose sum is σ = 120288000. Its totient is φ = 53402544.

The previous prime is 80649077. The next prime is 80649083. The reversal of 80649081 is 18094608.

It is a happy number.

80649081 is a `hidden beast` number, since 8 + 0 + 649 + 0 + 8 + 1 = 666.

It is not a de Polignac number, because 80649081 - 2² = 80649077 is a prime.

It is a super-2 number, since 2×80649081² = 13008548532289122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80649083) 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, 6001 + ... + 14046.

It is an arithmetic number, because the mean of its divisors is an integer number (7518000).

Almost surely, 2^80649081 is an apocalyptic number.

It is an amenable number.

80649081 is a deficient number, since it is larger than the sum of its proper divisors (39638919).

80649081 is a wasteful number, since it uses less digits than its factorization.

80649081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20205 (or 20199 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 80649081 is about 8980.4833388855. The cubic root of 80649081 is about 432.0491360005.

The spelling of 80649081 in words is "eighty million, six hundred forty-nine thousand, eighty-one".