80655640 has 64 divisors (see below), whose sum is σ = 197366400. Its totient is φ = 29486592.

The previous prime is 80655613. The next prime is 80655643. The reversal of 80655640 is 4655608.

It is a junction number, because it is equal to n+sod(n) for n = 80655596 and 80655605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80655643) 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, 55969 + ... + 57391.

It is an arithmetic number, because the mean of its divisors is an integer number (3083850).

Almost surely, 2^80655640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80655640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98683200).

80655640 is an abundant number, since it is smaller than the sum of its proper divisors (116710760).

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

80655640 is a wasteful number, since it uses less digits than its factorization.

80655640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1556 (or 1552 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 80655640 is about 8980.8485122509. The cubic root of 80655640 is about 432.0608481962.

The spelling of 80655640 in words is "eighty million, six hundred fifty-five thousand, six hundred forty".