80605840 has 80 divisors (see below), whose sum is σ = 226806912. Its totient is φ = 26007552.

The previous prime is 80605831. The next prime is 80605849. The reversal of 80605840 is 4850608.

It is an interprime number because it is at equal distance from previous prime (80605831) and next prime (80605849).

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (80605849) 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 15 ways as a sum of consecutive naturals, for example, 5287 + ... + 13753.

Almost surely, 2^80605840 is an apocalyptic number.

80605840 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 80605840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113403456).

80605840 is an abundant number, since it is smaller than the sum of its proper divisors (146201072).

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

80605840 is a wasteful number, since it uses less digits than its factorization.

80605840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8504 (or 8498 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 80605840 is about 8978.0755176151. The cubic root of 80605840 is about 431.9719060377.

The spelling of 80605840 in words is "eighty million, six hundred five thousand, eight hundred forty".