136878481 has 8 divisors (see below), whose sum is σ = 139633920. Its totient is φ = 134148768.

The previous prime is 136878479. The next prime is 136878491. The reversal of 136878481 is 184878631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 136878481 - 2¹ = 136878479 is a prime.

It is a super-2 number, since 2×136878481² = 37471437121734722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136878461) 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, 4500 + ... + 17146.

It is an arithmetic number, because the mean of its divisors is an integer number (17454240).

Almost surely, 2^136878481 is an apocalyptic number.

It is an amenable number.

136878481 is a deficient number, since it is larger than the sum of its proper divisors (2755439).

136878481 is a wasteful number, since it uses less digits than its factorization.

136878481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12863.

The product of its digits is 258048, while the sum is 46.

The square root of 136878481 is about 11699.5077246865. The cubic root of 136878481 is about 515.3612082503.

The spelling of 136878481 in words is "one hundred thirty-six million, eight hundred seventy-eight thousand, four hundred eighty-one".