80645136 has 160 divisors (see below), whose sum is σ = 253317120. Its totient is φ = 21772800.

The previous prime is 80645119. The next prime is 80645141. The reversal of 80645136 is 63154608.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 80645097 and 80645106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 212595 + ... + 212973.

It is an arithmetic number, because the mean of its divisors is an integer number (1583232).

Almost surely, 2^80645136 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 80645136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126658560).

80645136 is an abundant number, since it is smaller than the sum of its proper divisors (172671984).

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

80645136 is a wasteful number, since it uses less digits than its factorization.

80645136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445 (or 439 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 80645136 is about 8980.2636932331. The cubic root of 80645136 is about 432.0420912349.

The spelling of 80645136 in words is "eighty million, six hundred forty-five thousand, one hundred thirty-six".