67845561 has 32 divisors (see below), whose sum is σ = 113571840. Its totient is φ = 35126784.

The previous prime is 67845553. The next prime is 67845563. The reversal of 67845561 is 16554876.

It is not a de Polignac number, because 67845561 - 2³ = 67845553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (67845563) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5481 + ... + 12873.

It is an arithmetic number, because the mean of its divisors is an integer number (3549120).

Almost surely, 2^67845561 is an apocalyptic number.

It is an amenable number.

67845561 is a deficient number, since it is larger than the sum of its proper divisors (45726279).

67845561 is a wasteful number, since it uses less digits than its factorization.

67845561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7445.

The product of its digits is 201600, while the sum is 42.

The square root of 67845561 is about 8236.8416884143. The cubic root of 67845561 is about 407.8562726638.

The spelling of 67845561 in words is "sixty-seven million, eight hundred forty-five thousand, five hundred sixty-one".