16387388640 has 480 divisors, whose sum is σ = 68239632384. Its totient is φ = 3624238080.

The previous prime is 16387388627. The next prime is 16387388659. The reversal of 16387388640 is 4688378361.

It is a tau number, because it is divible by the number of its divisors (480).

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 polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2809407 + ... + 2815233.

Almost surely, 2^16387388640 is an apocalyptic number.

16387388640 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 16387388640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34119816192).

16387388640 is an abundant number, since it is smaller than the sum of its proper divisors (51852243744).

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

16387388640 is a wasteful number, since it uses less digits than its factorization.

16387388640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5892 (or 5875 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 54.

The spelling of 16387388640 in words is "sixteen billion, three hundred eighty-seven million, three hundred eighty-eight thousand, six hundred forty".