13897565280 has 240 divisors, whose sum is σ = 51932754720. Its totient is φ = 3487961088.

The previous prime is 13897565251. The next prime is 13897565303. The reversal of 13897565280 is 8256579831.

It is a tau number, because it is divible by the number of its divisors (240).

It is a super-2 number, since 2×13897565280² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 188781 + ... + 251859.

It is an arithmetic number, because the mean of its divisors is an integer number (216386478).

Almost surely, 2^13897565280 is an apocalyptic number.

13897565280 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 13897565280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25966377360).

13897565280 is an abundant number, since it is smaller than the sum of its proper divisors (38035189440).

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

13897565280 is a wasteful number, since it uses less digits than its factorization.

13897565280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63123 (or 63106 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 54.

The spelling of 13897565280 in words is "thirteen billion, eight hundred ninety-seven million, five hundred sixty-five thousand, two hundred eighty".