67528921 has 2 divisors, whose sum is σ = 67528922. Its totient is φ = 67528920.

The previous prime is 67528889. The next prime is 67528931. The reversal of 67528921 is 12982576.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34351321 + 33177600 = 5861^2 + 5760^2 .

It is a cyclic number.

It is not a de Polignac number, because 67528921 - 2⁵ = 67528889 is a prime.

It is not a weakly prime, because it can be changed into another prime (67528931) 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 as a sum of consecutive naturals, namely, 33764460 + 33764461.

It is an arithmetic number, because the mean of its divisors is an integer number (33764461).

Almost surely, 2^67528921 is an apocalyptic number.

It is an amenable number.

67528921 is a deficient number, since it is larger than the sum of its proper divisors (1).

67528921 is an equidigital number, since it uses as much as digits as its factorization.

67528921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 40.

The square root of 67528921 is about 8217.5982500972. The cubic root of 67528921 is about 407.2207850542.

The spelling of 67528921 in words is "sixty-seven million, five hundred twenty-eight thousand, nine hundred twenty-one".