77961611 has 8 divisors (see below), whose sum is σ = 95952864. Its totient is φ = 61683840.

The previous prime is 77961607. The next prime is 77961613. The reversal of 77961611 is 11616977.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77961611 - 2² = 77961607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77961613) 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 7 ways as a sum of consecutive naturals, for example, 428270 + ... + 428451.

It is an arithmetic number, because the mean of its divisors is an integer number (11994108).

Almost surely, 2^77961611 is an apocalyptic number.

77961611 is a deficient number, since it is larger than the sum of its proper divisors (17991253).

77961611 is a wasteful number, since it uses less digits than its factorization.

77961611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856741.

The product of its digits is 15876, while the sum is 38.

The square root of 77961611 is about 8829.5872496963. The cubic root of 77961611 is about 427.1957613277.

It can be divided in two parts, 77 and 961611, that multiplied together give a palindrome (74044047).

The spelling of 77961611 in words is "seventy-seven million, nine hundred sixty-one thousand, six hundred eleven".