1306645720 has 32 divisors (see below), whose sum is σ = 2961424800. Its totient is φ = 518841088.

The previous prime is 1306645699. The next prime is 1306645783. The reversal of 1306645720 is 275466031.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113740 + ... + 124699.

It is an arithmetic number, because the mean of its divisors is an integer number (92544525).

Almost surely, 2^1306645720 is an apocalyptic number.

1306645720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1306645720 is an abundant number, since it is smaller than the sum of its proper divisors (1654779080).

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

1306645720 is a wasteful number, since it uses less digits than its factorization.

1306645720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238587 (or 238583 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 1306645720 is about 36147.5548274015. The cubic root of 1306645720 is about 1093.2494899847.

The spelling of 1306645720 in words is "one billion, three hundred six million, six hundred forty-five thousand, seven hundred twenty".