137664026 has 4 divisors (see below), whose sum is σ = 206496042. Its totient is φ = 68832012.

The previous prime is 137664017. The next prime is 137664031. The reversal of 137664026 is 620466731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 620466731 = 17 ⋅36498043.

It can be written as a sum of positive squares in only one way, i.e., 135745801 + 1918225 = 11651^2 + 1385^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 34416005 + ... + 34416008.

Almost surely, 2^137664026 is an apocalyptic number.

137664026 is a deficient number, since it is larger than the sum of its proper divisors (68832016).

137664026 is an equidigital number, since it uses as much as digits as its factorization.

137664026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68832015.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 137664026 is about 11733.0314071002. The cubic root of 137664026 is about 516.3452134788.

The spelling of 137664026 in words is "one hundred thirty-seven million, six hundred sixty-four thousand, twenty-six".