136640769 has 8 divisors (see below), whose sum is σ = 190108992. Its totient is φ = 87133200.

The previous prime is 136640759. The next prime is 136640773. The reversal of 136640769 is 967046631.

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

It is not a de Polignac number, because 136640769 - 2⁵ = 136640737 is a prime.

It is a super-2 number, since 2×136640769² = 37341399505822722, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 136640769.

It is not an unprimeable number, because it can be changed into a prime (136640759) 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, 990082 + ... + 990219.

It is an arithmetic number, because the mean of its divisors is an integer number (23763624).

Almost surely, 2^136640769 is an apocalyptic number.

It is an amenable number.

136640769 is a deficient number, since it is larger than the sum of its proper divisors (53468223).

136640769 is a wasteful number, since it uses less digits than its factorization.

136640769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1980327.

The product of its (nonzero) digits is 163296, while the sum is 42.

The square root of 136640769 is about 11689.3442502135. The cubic root of 136640769 is about 515.0626988734.

The spelling of 136640769 in words is "one hundred thirty-six million, six hundred forty thousand, seven hundred sixty-nine".