136778775 has 48 divisors (see below), whose sum is σ = 262745088. Its totient is φ = 61488000.

The previous prime is 136778773. The next prime is 136778797. The reversal of 136778775 is 577877631.

It is a happy number.

It is not a de Polignac number, because 136778775 - 2¹ = 136778773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136778773) 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 47 ways as a sum of consecutive naturals, for example, 29890 + ... + 34160.

It is an arithmetic number, because the mean of its divisors is an integer number (5473856).

Almost surely, 2^136778775 is an apocalyptic number.

136778775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

136778775 is a deficient number, since it is larger than the sum of its proper divisors (125966313).

136778775 is a wasteful number, since it uses less digits than its factorization.

136778775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4352 (or 4347 counting only the distinct ones).

The product of its digits is 1728720, while the sum is 51.

The square root of 136778775 is about 11695.2458289683. The cubic root of 136778775 is about 515.2360434911.

The spelling of 136778775 in words is "one hundred thirty-six million, seven hundred seventy-eight thousand, seven hundred seventy-five".