77773961 has 4 divisors (see below), whose sum is σ = 78529152. Its totient is φ = 77018772.

The previous prime is 77773957. The next prime is 77773987. The reversal of 77773961 is 16937777.

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 77773961 - 2² = 77773957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (77773931) 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, 377441 + ... + 377646.

It is an arithmetic number, because the mean of its divisors is an integer number (19632288).

Almost surely, 2^77773961 is an apocalyptic number.

It is an amenable number.

77773961 is a deficient number, since it is larger than the sum of its proper divisors (755191).

77773961 is a wasteful number, since it uses less digits than its factorization.

77773961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755190.

The product of its digits is 388962, while the sum is 47.

The square root of 77773961 is about 8818.9546432670. The cubic root of 77773961 is about 426.8527391396.

The spelling of 77773961 in words is "seventy-seven million, seven hundred seventy-three thousand, nine hundred sixty-one".