136785731 has 8 divisors (see below), whose sum is σ = 145121280. Its totient is φ = 128563848.

The previous prime is 136785673. The next prime is 136785749. The reversal of 136785731 is 137587631.

136785731 = 399² + 400² + ... + 779².

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 136785731 - 2²² = 132591427 is a prime.

It is a super-2 number, since 2×136785731² = 37420672410408722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136785331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25931 + ... + 30756.

It is an arithmetic number, because the mean of its divisors is an integer number (18140160).

Almost surely, 2^136785731 is an apocalyptic number.

136785731 is a deficient number, since it is larger than the sum of its proper divisors (8335549).

136785731 is a wasteful number, since it uses less digits than its factorization.

136785731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56833.

The product of its digits is 105840, while the sum is 41.

The square root of 136785731 is about 11695.5432109843. The cubic root of 136785731 is about 515.2447775976.

The spelling of 136785731 in words is "one hundred thirty-six million, seven hundred eighty-five thousand, seven hundred thirty-one".