87691075038779 has 16 divisors (see below), whose sum is σ = 90896024375520. Its totient is φ = 84498351275520.

The previous prime is 87691075038757. The next prime is 87691075038797. The reversal of 87691075038779 is 97783057019678.

It is not a de Polignac number, because 87691075038779 - 2²⁰ = 87691073990203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87691075038709) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31209539 + ... + 33903059.

It is an arithmetic number, because the mean of its divisors is an integer number (5681001523470).

Almost surely, 2^{87691075038779} is an apocalyptic number.

87691075038779 is a deficient number, since it is larger than the sum of its proper divisors (3204949336741).

87691075038779 is a wasteful number, since it uses less digits than its factorization.

87691075038779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2695790.

The product of its (nonzero) digits is 1120210560, while the sum is 77.

The spelling of 87691075038779 in words is "eighty-seven trillion, six hundred ninety-one billion, seventy-five million, thirty-eight thousand, seven hundred seventy-nine".