136399680 has 112 divisors (see below), whose sum is σ = 481218240. Its totient is φ = 36370944.

The previous prime is 136399667. The next prime is 136399691. The reversal of 136399680 is 86993631.

136399680 is a `hidden beast` number, since 1 + 3 + 639 + 9 + 6 + 8 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 747 + ... + 16533.

Almost surely, 2^136399680 is an apocalyptic number.

136399680 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 136399680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (240609120).

136399680 is an abundant number, since it is smaller than the sum of its proper divisors (344818560).

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

136399680 is a wasteful number, since it uses less digits than its factorization.

136399680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15813 (or 15797 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The square root of 136399680 is about 11679.0273567622. The cubic root of 136399680 is about 514.7595949618.

The spelling of 136399680 in words is "one hundred thirty-six million, three hundred ninety-nine thousand, six hundred eighty".