13402489728 has 64 divisors (see below), whose sum is σ = 35714422800. Its totient is φ = 4453183488.

The previous prime is 13402489717. The next prime is 13402489739. The reversal of 13402489728 is 82798420431.

It is an interprime number because it is at equal distance from previous prime (13402489717) and next prime (13402489739).

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64438 + ... + 175946.

Almost surely, 2^13402489728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13402489728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17857211400).

13402489728 is an abundant number, since it is smaller than the sum of its proper divisors (22311933072).

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

13402489728 is a wasteful number, since it uses less digits than its factorization.

13402489728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111839 (or 111827 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 48.

The spelling of 13402489728 in words is "thirteen billion, four hundred two million, four hundred eighty-nine thousand, seven hundred twenty-eight".