67767961 has 4 divisors (see below), whose sum is σ = 67784500. Its totient is φ = 67751424.

The previous prime is 67767941. The next prime is 67767977. The reversal of 67767961 is 16976776.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 45968400 + 21799561 = 6780^2 + 4669^2 .

It is a cyclic number.

It is not a de Polignac number, because 67767961 - 2⁵ = 67767929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67767901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2965 + ... + 12013.

It is an arithmetic number, because the mean of its divisors is an integer number (16946125).

Almost surely, 2^67767961 is an apocalyptic number.

It is an amenable number.

67767961 is a deficient number, since it is larger than the sum of its proper divisors (16539).

67767961 is an equidigital number, since it uses as much as digits as its factorization.

67767961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16538.

The product of its digits is 666792, while the sum is 49.

The square root of 67767961 is about 8232.1297973246. The cubic root of 67767961 is about 407.7007148516.

The spelling of 67767961 in words is "sixty-seven million, seven hundred sixty-seven thousand, nine hundred sixty-one".