135688890 has 16 divisors (see below), whose sum is σ = 325653408. Its totient is φ = 36183696.

The previous prime is 135688877. The next prime is 135688897. The reversal of 135688890 is 98886531.

It is a super-2 number, since 2×135688890² = 36822949738864200, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (135688897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2261452 + ... + 2261511.

It is an arithmetic number, because the mean of its divisors is an integer number (20353338).

Almost surely, 2^135688890 is an apocalyptic number.

135688890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

135688890 is an abundant number, since it is smaller than the sum of its proper divisors (189964518).

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

135688890 is a wasteful number, since it uses less digits than its factorization.

135688890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4522973.

The product of its (nonzero) digits is 414720, while the sum is 48.

The square root of 135688890 is about 11648.5574214149. The cubic root of 135688890 is about 513.8638856931.

The spelling of 135688890 in words is "one hundred thirty-five million, six hundred eighty-eight thousand, eight hundred ninety".