136989887904 has 120 divisors (see below), whose sum is σ = 404994256128. Its totient is φ = 45424056960.

The previous prime is 136989887869. The next prime is 136989887971. The reversal of 136989887904 is 409788989631.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 356719 + ... + 633425.

Almost surely, 2^136989887904 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 136989887904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (202497128064).

136989887904 is an abundant number, since it is smaller than the sum of its proper divisors (268004368224).

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

136989887904 is a wasteful number, since it uses less digits than its factorization.

136989887904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276920 (or 276903 counting only the distinct ones).

The product of its (nonzero) digits is 188116992, while the sum is 72.

The spelling of 136989887904 in words is "one hundred thirty-six billion, nine hundred eighty-nine million, eight hundred eighty-seven thousand, nine hundred four".