80649440 has 48 divisors (see below), whose sum is σ = 192861648. Its totient is φ = 31865856.

The previous prime is 80649421. The next prime is 80649461. The reversal of 80649440 is 4494608.

It is a self number, because there is not a number n which added to its sum of digits gives 80649440.

It is a congruent number.

It is an unprimeable number.

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, 10244 + ... + 16316.

It is an arithmetic number, because the mean of its divisors is an integer number (4017951).

Almost surely, 2^80649440 is an apocalyptic number.

80649440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80649440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96430824).

80649440 is an abundant number, since it is smaller than the sum of its proper divisors (112212208).

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

80649440 is a wasteful number, since it uses less digits than its factorization.

80649440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6171 (or 6163 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 80649440 is about 8980.5033266516. The cubic root of 80649440 is about 432.0497770717.

The spelling of 80649440 in words is "eighty million, six hundred forty-nine thousand, four hundred forty".