1308072720 has 40 divisors (see below), whose sum is σ = 4055026176. Its totient is φ = 348819328.

The previous prime is 1308072709. The next prime is 1308072737. The reversal of 1308072720 is 272708031.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×1308072720² = 3422108481616396800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2724912 + ... + 2725391.

Almost surely, 2^1308072720 is an apocalyptic number.

1308072720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1308072720 is an abundant number, since it is smaller than the sum of its proper divisors (2746953456).

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

1308072720 is a wasteful number, since it uses less digits than its factorization.

1308072720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5450319 (or 5450313 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 1308072720 is about 36167.2879823743. The cubic root of 1308072720 is about 1093.6473278535.

The spelling of 1308072720 in words is "one billion, three hundred eight million, seventy-two thousand, seven hundred twenty".