77781941 has 4 divisors (see below), whose sum is σ = 77826432. Its totient is φ = 77737452.

The previous prime is 77781937. The next prime is 77781971. The reversal of 77781941 is 14918777.

It is a happy number.

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 77781941 - 2² = 77781937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77781892 and 77781901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77781931) 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, 19511 + ... + 23156.

It is an arithmetic number, because the mean of its divisors is an integer number (19456608).

Almost surely, 2^77781941 is an apocalyptic number.

It is an amenable number.

77781941 is a deficient number, since it is larger than the sum of its proper divisors (44491).

77781941 is a wasteful number, since it uses less digits than its factorization.

77781941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44490.

The product of its digits is 98784, while the sum is 44.

The square root of 77781941 is about 8819.4070662375. The cubic root of 77781941 is about 426.8673377204.

The spelling of 77781941 in words is "seventy-seven million, seven hundred eighty-one thousand, nine hundred forty-one".