1313252720 has 80 divisors (see below), whose sum is σ = 3481652160. Its totient is φ = 456364032.

The previous prime is 1313252693. The next prime is 1313252741. The reversal of 1313252720 is 272523131.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 1313252720.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19460 + ... + 54819.

It is an arithmetic number, because the mean of its divisors is an integer number (43520652).

Almost surely, 2^1313252720 is an apocalyptic number.

1313252720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1313252720 is an abundant number, since it is smaller than the sum of its proper divisors (2168399440).

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

1313252720 is a wasteful number, since it uses less digits than its factorization.

1313252720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74322 (or 74316 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 1313252720 is about 36238.8288994002. The cubic root of 1313252720 is about 1095.0890498390.

Adding to 1313252720 its reverse (272523131), we get a palindrome (1585775851).

The spelling of 1313252720 in words is "one billion, three hundred thirteen million, two hundred fifty-two thousand, seven hundred twenty".