13978732757 has 12 divisors (see below), whose sum is σ = 15537706380. Its totient is φ = 12565143360.

The previous prime is 13978732727. The next prime is 13978732777. The reversal of 13978732757 is 75723787931.

It can be written as a sum of positive squares in 2 ways, for example, as 1064455876 + 12914276881 = 32626^2 + 113641^2 .

It is not a de Polignac number, because 13978732757 - 2¹⁰ = 13978731733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13978732696 and 13978732705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13978732717) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 638258 + ... + 659795.

It is an arithmetic number, because the mean of its divisors is an integer number (1294808865).

Almost surely, 2^13978732757 is an apocalyptic number.

It is an amenable number.

13978732757 is a deficient number, since it is larger than the sum of its proper divisors (1558973623).

13978732757 is a wasteful number, since it uses less digits than its factorization.

13978732757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1298164 (or 1298153 counting only the distinct ones).

The product of its digits is 15558480, while the sum is 59.

The spelling of 13978732757 in words is "thirteen billion, nine hundred seventy-eight million, seven hundred thirty-two thousand, seven hundred fifty-seven".