67290561 has 24 divisors (see below), whose sum is σ = 107955360. Its totient is φ = 41406768.

The previous prime is 67290557. The next prime is 67290563. The reversal of 67290561 is 16509276.

67290561 is a `hidden beast` number, since 6 + 7 + 2 + 90 + 561 = 666.

It is not a de Polignac number, because 67290561 - 2² = 67290557 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (67290563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2811 + ... + 11936.

It is an arithmetic number, because the mean of its divisors is an integer number (4498140).

Almost surely, 2^67290561 is an apocalyptic number.

It is an amenable number.

67290561 is a deficient number, since it is larger than the sum of its proper divisors (40664799).

67290561 is a wasteful number, since it uses less digits than its factorization.

67290561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14782 (or 14763 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 67290561 is about 8203.0824084609. The cubic root of 67290561 is about 406.7410914429.

The spelling of 67290561 in words is "sixty-seven million, two hundred ninety thousand, five hundred sixty-one".