13780297440 has 864 divisors, whose sum is σ = 59949935136. Its totient is φ = 2856591360.

The previous prime is 13780297439. The next prime is 13780297451. The reversal of 13780297440 is 4479208731.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 76134150 + ... + 76134330.

It is an arithmetic number, because the mean of its divisors is an integer number (69386499).

Almost surely, 2^13780297440 is an apocalyptic number.

13780297440 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 13780297440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29974967568).

13780297440 is an abundant number, since it is smaller than the sum of its proper divisors (46169637696).

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

13780297440 is a wasteful number, since it uses less digits than its factorization.

13780297440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312 (or 294 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The spelling of 13780297440 in words is "thirteen billion, seven hundred eighty million, two hundred ninety-seven thousand, four hundred forty".