136785420 has 72 divisors (see below), whose sum is σ = 415995216. Its totient is φ = 36381312.

The previous prime is 136785413. The next prime is 136785437. The reversal of 136785420 is 24587631.

It is a super-2 number, since 2×136785420² = 37420502249152800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 93414 + ... + 94866.

Almost surely, 2^136785420 is an apocalyptic number.

136785420 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 136785420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207997608).

136785420 is an abundant number, since it is smaller than the sum of its proper divisors (279209796).

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

136785420 is a wasteful number, since it uses less digits than its factorization.

136785420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1991 (or 1986 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 136785420 is about 11695.5299153138. The cubic root of 136785420 is about 515.2443871055.

The spelling of 136785420 in words is "one hundred thirty-six million, seven hundred eighty-five thousand, four hundred twenty".