68900561 has 4 divisors (see below), whose sum is σ = 69772800. Its totient is φ = 68028324.

The previous prime is 68900527. The next prime is 68900567. The reversal of 68900561 is 16500986.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16500986 = 2 ⋅8250493.

It is a cyclic number.

It is not a de Polignac number, because 68900561 - 2²⁶ = 1791697 is a prime.

It is a super-2 number, since 2×68900561² = 9494574612229442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68900567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 436001 + ... + 436158.

It is an arithmetic number, because the mean of its divisors is an integer number (17443200).

Almost surely, 2^68900561 is an apocalyptic number.

It is an amenable number.

68900561 is a deficient number, since it is larger than the sum of its proper divisors (872239).

68900561 is an equidigital number, since it uses as much as digits as its factorization.

68900561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872238.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 68900561 is about 8300.6361804382. The cubic root of 68900561 is about 409.9594665462.

The spelling of 68900561 in words is "sixty-eight million, nine hundred thousand, five hundred sixty-one".