67488821 has 4 divisors (see below), whose sum is σ = 67578732. Its totient is φ = 67398912.

The previous prime is 67488797. The next prime is 67488823. The reversal of 67488821 is 12888476.

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 28238596 + 39250225 = 5314^2 + 6265^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67488821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67488823) 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, 43820 + ... + 45333.

It is an arithmetic number, because the mean of its divisors is an integer number (16894683).

Almost surely, 2^67488821 is an apocalyptic number.

It is an amenable number.

67488821 is a deficient number, since it is larger than the sum of its proper divisors (89911).

67488821 is an equidigital number, since it uses as much as digits as its factorization.

67488821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89910.

The product of its digits is 172032, while the sum is 44.

The square root of 67488821 is about 8215.1580021324. The cubic root of 67488821 is about 407.1401638597.

The spelling of 67488821 in words is "sixty-seven million, four hundred eighty-eight thousand, eight hundred twenty-one".