80861020 has 48 divisors (see below), whose sum is σ = 179617536. Its totient is φ = 30528000.

The previous prime is 80860999. The next prime is 80861029. The reversal of 80861020 is 2016808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80861029) 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, 23830 + ... + 27010.

It is an arithmetic number, because the mean of its divisors is an integer number (3742032).

Almost surely, 2^80861020 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 80861020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89808768).

80861020 is an abundant number, since it is smaller than the sum of its proper divisors (98756516).

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

80861020 is a wasteful number, since it uses less digits than its factorization.

80861020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3262 (or 3260 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 80861020 is about 8992.2755740691. The cubic root of 80861020 is about 432.4272678881.

Adding to 80861020 its reverse (2016808), we get a palindrome (82877828).

The spelling of 80861020 in words is "eighty million, eight hundred sixty-one thousand, twenty".