77961065 has 32 divisors (see below), whose sum is σ = 121927680. Its totient is φ = 46439424.

The previous prime is 77961061. The next prime is 77961089. The reversal of 77961065 is 56016977.

It is a cyclic number.

It is not a de Polignac number, because 77961065 - 2² = 77961061 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (77961061) 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, 2696 + ... + 12774.

It is an arithmetic number, because the mean of its divisors is an integer number (3810240).

Almost surely, 2^77961065 is an apocalyptic number.

It is an amenable number.

77961065 is a deficient number, since it is larger than the sum of its proper divisors (43966615).

77961065 is a wasteful number, since it uses less digits than its factorization.

77961065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10121.

The product of its (nonzero) digits is 79380, while the sum is 41.

The square root of 77961065 is about 8829.5563308696. The cubic root of 77961065 is about 427.1947640445.

The spelling of 77961065 in words is "seventy-seven million, nine hundred sixty-one thousand, sixty-five".