67400561 has 4 divisors (see below), whose sum is σ = 67428672. Its totient is φ = 67372452.

The previous prime is 67400549. The next prime is 67400587. The reversal of 67400561 is 16500476.

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.

It is a cyclic number.

It is not a de Polignac number, because 67400561 - 2⁶ = 67400497 is a prime.

It is a super-2 number, since 2×67400561² = 9085671246229442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67400161) 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 in 3 ways as a sum of consecutive naturals, for example, 10085 + ... + 15378.

It is an arithmetic number, because the mean of its divisors is an integer number (16857168).

Almost surely, 2^67400561 is an apocalyptic number.

It is an amenable number.

67400561 is a deficient number, since it is larger than the sum of its proper divisors (28111).

67400561 is a wasteful number, since it uses less digits than its factorization.

67400561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28110.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 67400561 is about 8209.7844673292. The cubic root of 67400561 is about 406.9626042466.

The spelling of 67400561 in words is "sixty-seven million, four hundred thousand, five hundred sixty-one".