80812100 has 36 divisors (see below), whose sum is σ = 176322048. Its totient is φ = 32148000.

The previous prime is 80812099. The next prime is 80812103. The reversal of 80812100 is 121808.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80812103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16985 + ... + 21215.

Almost surely, 2^80812100 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 80812100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88161024).

80812100 is an abundant number, since it is smaller than the sum of its proper divisors (95509948).

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

80812100 is a wasteful number, since it uses less digits than its factorization.

80812100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4436 (or 4429 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 80812100 is about 8989.5550501679. Note that the first 3 decimals coincide. The cubic root of 80812100 is about 432.3400457654.

Adding to 80812100 its reverse (121808), we get a palindrome (80933908).

The spelling of 80812100 in words is "eighty million, eight hundred twelve thousand, one hundred".