1285332180 has 72 divisors (see below), whose sum is σ = 3955871136. Its totient is φ = 311593920.

The previous prime is 1285332163. The next prime is 1285332187. The reversal of 1285332180 is 812335821.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285332187) 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, 81262 + ... + 95781.

Almost surely, 2^1285332180 is an apocalyptic number.

1285332180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1285332180 is an abundant number, since it is smaller than the sum of its proper divisors (2670538956).

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

1285332180 is a wasteful number, since it uses less digits than its factorization.

1285332180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177077 (or 177064 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 1285332180 is about 35851.5296744783. The cubic root of 1285332180 is about 1087.2726415973.

The spelling of 1285332180 in words is "one billion, two hundred eighty-five million, three hundred thirty-two thousand, one hundred eighty".