136778767 has 4 divisors (see below), whose sum is σ = 136857096. Its totient is φ = 136700440.

The previous prime is 136778737. The next prime is 136778773. The reversal of 136778767 is 767877631.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 136778767 - 2⁷ = 136778639 is a prime.

It is a super-2 number, since 2×136778767² = 37416862204080578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136778737) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 36484 + ... + 40057.

It is an arithmetic number, because the mean of its divisors is an integer number (34214274).

Almost surely, 2^136778767 is an apocalyptic number.

136778767 is a deficient number, since it is larger than the sum of its proper divisors (78329).

136778767 is an equidigital number, since it uses as much as digits as its factorization.

136778767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78328.

The product of its digits is 2074464, while the sum is 52.

The square root of 136778767 is about 11695.2454869490. The cubic root of 136778767 is about 515.2360334460.

The spelling of 136778767 in words is "one hundred thirty-six million, seven hundred seventy-eight thousand, seven hundred sixty-seven".