136221756 has 48 divisors (see below), whose sum is σ = 350353920. Its totient is φ = 40849920.

The previous prime is 136221749. The next prime is 136221793. The reversal of 136221756 is 657122631.

It is a Harshad number since it is a multiple of its sum of digits (33).

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, 7485 + ... + 18123.

It is an arithmetic number, because the mean of its divisors is an integer number (7299040).

Almost surely, 2^136221756 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 136221756, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175176960).

136221756 is an abundant number, since it is smaller than the sum of its proper divisors (214132164).

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

136221756 is a wasteful number, since it uses less digits than its factorization.

136221756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10754 (or 10752 counting only the distinct ones).

The product of its digits is 15120, while the sum is 33.

The square root of 136221756 is about 11671.4076271888. The cubic root of 136221756 is about 514.5356747432.

The spelling of 136221756 in words is "one hundred thirty-six million, two hundred twenty-one thousand, seven hundred fifty-six".