135661872 has 40 divisors (see below), whose sum is σ = 354084976. Its totient is φ = 44752896.

The previous prime is 135661871. The next prime is 135661879. The reversal of 135661872 is 278166531.

It is a self number, because there is not a number n which added to its sum of digits gives 135661872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135661871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9913 + ... + 19224.

Almost surely, 2^135661872 is an apocalyptic number.

135661872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

135661872 is an abundant number, since it is smaller than the sum of its proper divisors (218423104).

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

135661872 is a wasteful number, since it uses less digits than its factorization.

135661872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29245 (or 29239 counting only the distinct ones).

The product of its digits is 60480, while the sum is 39.

The square root of 135661872 is about 11647.3976492605. The cubic root of 135661872 is about 513.8297770395.

The spelling of 135661872 in words is "one hundred thirty-five million, six hundred sixty-one thousand, eight hundred seventy-two".