77769961 has 4 divisors (see below), whose sum is σ = 77932800. Its totient is φ = 77607124.

The previous prime is 77769959. The next prime is 77770009. The reversal of 77769961 is 16996777.

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 77769961 - 2¹ = 77769959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77769899 and 77769908.

It is not an unprimeable number, because it can be changed into a prime (77769911) 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 3 ways as a sum of consecutive naturals, for example, 80701 + ... + 81658.

It is an arithmetic number, because the mean of its divisors is an integer number (19483200).

Almost surely, 2^77769961 is an apocalyptic number.

It is an amenable number.

77769961 is a deficient number, since it is larger than the sum of its proper divisors (162839).

77769961 is a wasteful number, since it uses less digits than its factorization.

77769961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162838.

The product of its digits is 1000188, while the sum is 52.

The square root of 77769961 is about 8818.7278561026. The cubic root of 77769961 is about 426.8454211795.

The spelling of 77769961 in words is "seventy-seven million, seven hundred sixty-nine thousand, nine hundred sixty-one".