11987342640 has 240 divisors, whose sum is σ = 49547953728. Its totient is φ = 2529183744.

The previous prime is 11987342639. The next prime is 11987342659. The reversal of 11987342640 is 4624378911.

11987342640 is a `hidden beast` number, since 119 + 8 + 73 + 426 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25959 + ... + 156998.

Almost surely, 2^11987342640 is an apocalyptic number.

11987342640 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 11987342640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24773976864).

11987342640 is an abundant number, since it is smaller than the sum of its proper divisors (37560611088).

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

11987342640 is a wasteful number, since it uses less digits than its factorization.

11987342640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182996 (or 182987 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 11987342640 in words is "eleven billion, nine hundred eighty-seven million, three hundred forty-two thousand, six hundred forty".