67528991 has 2 divisors, whose sum is σ = 67528992. Its totient is φ = 67528990.

The previous prime is 67528987. The next prime is 67529047. The reversal of 67528991 is 19982576.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 67528991 - 2² = 67528987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67528921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33764495 + 33764496.

It is an arithmetic number, because the mean of its divisors is an integer number (33764496).

Almost surely, 2^67528991 is an apocalyptic number.

67528991 is a deficient number, since it is larger than the sum of its proper divisors (1).

67528991 is an equidigital number, since it uses as much as digits as its factorization.

67528991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 47.

The square root of 67528991 is about 8217.6025092481. The cubic root of 67528991 is about 407.2209257615.

The spelling of 67528991 in words is "sixty-seven million, five hundred twenty-eight thousand, nine hundred ninety-one".