67721875 has 24 divisors (see below), whose sum is σ = 91212912. Its totient is φ = 49980000.

The previous prime is 67721869. The next prime is 67721879. The reversal of 67721875 is 57812776.

It is not a de Polignac number, because 67721875 - 2⁷ = 67721747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67721879) 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 23 ways as a sum of consecutive naturals, for example, 39792 + ... + 41458.

It is an arithmetic number, because the mean of its divisors is an integer number (3800538).

Almost surely, 2^67721875 is an apocalyptic number.

67721875 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

67721875 is a deficient number, since it is larger than the sum of its proper divisors (23491037).

67721875 is an equidigital number, since it uses as much as digits as its factorization.

67721875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1705 (or 1685 counting only the distinct ones).

The product of its digits is 164640, while the sum is 43.

The square root of 67721875 is about 8229.3301671521. The cubic root of 67721875 is about 407.6082741381.

Subtracting from 67721875 its reverse (57812776), we obtain a palindrome (9909099).

The spelling of 67721875 in words is "sixty-seven million, seven hundred twenty-one thousand, eight hundred seventy-five".