180820878 has 48 divisors (see below), whose sum is σ = 421956864. Its totient is φ = 51507120.

The previous prime is 180820877. The next prime is 180820879. The reversal of 180820878 is 878028081.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (180820877) and next prime (180820879).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180820877) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 126001 + ... + 127427.

It is an arithmetic number, because the mean of its divisors is an integer number (8790768).

Almost surely, 2^180820878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 180820878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210978432).

180820878 is an abundant number, since it is smaller than the sum of its proper divisors (241135986).

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

180820878 is a wasteful number, since it uses less digits than its factorization.

180820878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1877 (or 1870 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 42.

The square root of 180820878 is about 13446.9653825687. The cubic root of 180820878 is about 565.4786222893.

The spelling of 180820878 in words is "one hundred eighty million, eight hundred twenty thousand, eight hundred seventy-eight".