136673857 has 4 divisors (see below), whose sum is σ = 136755540. Its totient is φ = 136592176.

The previous prime is 136673851. The next prime is 136673879. The reversal of 136673857 is 758376631.

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

It can be written as a sum of positive squares in 2 ways, for example, as 40947201 + 95726656 = 6399^2 + 9784^2 .

It is a cyclic number.

It is not a de Polignac number, because 136673857 - 2⁷ = 136673729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136673851) 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, 38278 + ... + 41695.

It is an arithmetic number, because the mean of its divisors is an integer number (34188885).

Almost surely, 2^136673857 is an apocalyptic number.

It is an amenable number.

136673857 is a deficient number, since it is larger than the sum of its proper divisors (81683).

136673857 is an equidigital number, since it uses as much as digits as its factorization.

136673857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81682.

The product of its digits is 635040, while the sum is 46.

The square root of 136673857 is about 11690.7594706247. The cubic root of 136673857 is about 515.1042702123.

The spelling of 136673857 in words is "one hundred thirty-six million, six hundred seventy-three thousand, eight hundred fifty-seven".