77928673441 has 4 divisors (see below), whose sum is σ = 77967082900. Its totient is φ = 77890263984.

The previous prime is 77928673429. The next prime is 77928673463. The reversal of 77928673441 is 14437682977.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47862500625 + 30066172816 = 218775^2 + 173396^2 .

It is a cyclic number.

It is not a de Polignac number, because 77928673441 - 2¹¹ = 77928671393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77928673481) 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, 19201686 + ... + 19205743.

It is an arithmetic number, because the mean of its divisors is an integer number (19491770725).

Almost surely, 2^77928673441 is an apocalyptic number.

It is an amenable number.

77928673441 is a deficient number, since it is larger than the sum of its proper divisors (38409459).

77928673441 is a wasteful number, since it uses less digits than its factorization.

77928673441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38409458.

The product of its digits is 14224896, while the sum is 58.

The spelling of 77928673441 in words is "seventy-seven billion, nine hundred twenty-eight million, six hundred seventy-three thousand, four hundred forty-one".