136721875 has 24 divisors (see below), whose sum is σ = 173707632. Its totient is φ = 107580000.

The previous prime is 136721831. The next prime is 136721909. The reversal of 136721875 is 578127631.

It is not a de Polignac number, because 136721875 - 2²⁷ = 2504147 is a prime.

It is a super-2 number, since 2×136721875² = 37385742207031250, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 209049 + ... + 209701.

It is an arithmetic number, because the mean of its divisors is an integer number (7237818).

Almost surely, 2^136721875 is an apocalyptic number.

136721875 is a deficient number, since it is larger than the sum of its proper divisors (36985757).

136721875 is an frugal number, since it uses more digits than its factorization.

136721875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745 (or 725 counting only the distinct ones).

The product of its digits is 70560, while the sum is 40.

The square root of 136721875 is about 11692.8129635259. The cubic root of 136721875 is about 515.1645874798.

The spelling of 136721875 in words is "one hundred thirty-six million, seven hundred twenty-one thousand, eight hundred seventy-five".