1304631660 has 24 divisors (see below), whose sum is σ = 3652968816. Its totient is φ = 347901760.

The previous prime is 1304631631. The next prime is 1304631661. The reversal of 1304631660 is 661364031.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (1304631661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10871871 + ... + 10871990.

It is an arithmetic number, because the mean of its divisors is an integer number (152207034).

Almost surely, 2^1304631660 is an apocalyptic number.

1304631660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1304631660 is an abundant number, since it is smaller than the sum of its proper divisors (2348337156).

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

1304631660 is a wasteful number, since it uses less digits than its factorization.

1304631660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21743873 (or 21743871 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 1304631660 is about 36119.6852145752. The cubic root of 1304631660 is about 1092.6874905785.

Adding to 1304631660 its reverse (661364031), we get a palindrome (1965995691).

The spelling of 1304631660 in words is "one billion, three hundred four million, six hundred thirty-one thousand, six hundred sixty".