136620840 has 128 divisors (see below), whose sum is σ = 437477760. Its totient is φ = 34013184.

The previous prime is 136620829. The next prime is 136620877. The reversal of 136620840 is 48026631.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 136620798 and 136620807.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 393547 + ... + 393893.

It is an arithmetic number, because the mean of its divisors is an integer number (3417795).

Almost surely, 2^136620840 is an apocalyptic number.

136620840 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 136620840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218738880).

136620840 is an abundant number, since it is smaller than the sum of its proper divisors (300856920).

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

136620840 is a wasteful number, since it uses less digits than its factorization.

136620840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571 (or 567 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 136620840 is about 11688.4917761018. The cubic root of 136620840 is about 515.0376570950.

The spelling of 136620840 in words is "one hundred thirty-six million, six hundred twenty thousand, eight hundred forty".