80636140 has 48 divisors (see below), whose sum is σ = 183018528. Its totient is φ = 29666304.

The previous prime is 80636123. The next prime is 80636141. The reversal of 80636140 is 4163608.

It is a junction number, because it is equal to n+sod(n) for n = 80636099 and 80636108.

It is not an unprimeable number, because it can be changed into a prime (80636141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135684 + ... + 136276.

It is an arithmetic number, because the mean of its divisors is an integer number (3812886).

Almost surely, 2^80636140 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 80636140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91509264).

80636140 is an abundant number, since it is smaller than the sum of its proper divisors (102382388).

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

80636140 is a wasteful number, since it uses less digits than its factorization.

80636140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138 (or 1136 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 80636140 is about 8979.7628031034. The cubic root of 80636140 is about 432.0260258097.

Adding to 80636140 its reverse (4163608), we get a palindrome (84799748).

The spelling of 80636140 in words is "eighty million, six hundred thirty-six thousand, one hundred forty".