1671668280 has 160 divisors (see below), whose sum is σ = 5639016240. Its totient is φ = 444165120.

The previous prime is 1671668261. The next prime is 1671668287. The reversal of 1671668280 is 828661761.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1671668287) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1091115 + ... + 1092645.

Almost surely, 2^1671668280 is an apocalyptic number.

1671668280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1671668280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2819508120).

1671668280 is an abundant number, since it is smaller than the sum of its proper divisors (3967347960).

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

1671668280 is a wasteful number, since it uses less digits than its factorization.

1671668280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1891 (or 1878 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 1671668280 is about 40886.0401604264. The cubic root of 1671668280 is about 1186.8159307395.

The spelling of 1671668280 in words is "one billion, six hundred seventy-one million, six hundred sixty-eight thousand, two hundred eighty".