13758728 has 8 divisors (see below), whose sum is σ = 25797630. Its totient is φ = 6879360.

The previous prime is 13758727. The next prime is 13758737. The reversal of 13758728 is 82785731.

It can be written as a sum of positive squares in only one way, i.e., 11957764 + 1800964 = 3458^2 + 1342^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×13758728³ (a number of 22 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (13758721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 859913 + ... + 859928.

Almost surely, 2^13758728 is an apocalyptic number.

It is an amenable number.

13758728 is a deficient number, since it is larger than the sum of its proper divisors (12038902).

13758728 is a wasteful number, since it uses less digits than its factorization.

13758728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1719847 (or 1719843 counting only the distinct ones).

The product of its digits is 94080, while the sum is 41.

The square root of 13758728 is about 3709.2759401263. The cubic root of 13758728 is about 239.6216724497.

The spelling of 13758728 in words is "thirteen million, seven hundred fifty-eight thousand, seven hundred twenty-eight".