136899589428 has 378 divisors, whose sum is σ = 432188142498. Its totient is φ = 37814454720.

The previous prime is 136899589417. The next prime is 136899589433. The reversal of 136899589428 is 824985998631.

136899589428 is a `hidden beast` number, since 1 + 3 + 68 + 99 + 58 + 9 + 428 = 666.

It can be written as a sum of positive squares in only one way, i.e., 131956374564 + 4943214864 = 363258^2 + 70308^2 .

It is a tau number, because it is divible by the number of its divisors (378).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 125 ways as a sum of consecutive naturals, for example, 137311026 + ... + 137312022.

Almost surely, 2^136899589428 is an apocalyptic number.

136899589428 is a gapful number since it is divisible by the number (18) 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 136899589428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (216094071249).

136899589428 is an abundant number, since it is smaller than the sum of its proper divisors (295288553070).

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

136899589428 is an equidigital number, since it uses as much as digits as its factorization.

136899589428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095 (or 1040 counting only the distinct ones).

The product of its digits is 268738560, while the sum is 72.

The spelling of 136899589428 in words is "one hundred thirty-six billion, eight hundred ninety-nine million, five hundred eighty-nine thousand, four hundred twenty-eight".