80645544 has 160 divisors (see below), whose sum is σ = 269723520. Its totient is φ = 22011264.

The previous prime is 80645527. The next prime is 80645581. The reversal of 80645544 is 44554608.

80645544 is a `hidden beast` number, since 8 + 0 + 645 + 5 + 4 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 80645499 and 80645508.

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 39 ways as a sum of consecutive naturals, for example, 103942 + ... + 104714.

It is an arithmetic number, because the mean of its divisors is an integer number (1685772).

Almost surely, 2^80645544 is an apocalyptic number.

80645544 is a gapful number since it is divisible by the number (84) 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 80645544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134861760).

80645544 is an abundant number, since it is smaller than the sum of its proper divisors (189077976).

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

80645544 is a wasteful number, since it uses less digits than its factorization.

80645544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821 (or 808 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 36.

The square root of 80645544 is about 8980.2864096865. The cubic root of 80645544 is about 432.0428198296.

The spelling of 80645544 in words is "eighty million, six hundred forty-five thousand, five hundred forty-four".