77938691929 has 16 divisors (see below), whose sum is σ = 97564521600. Its totient is φ = 60706808064.

The previous prime is 77938691911. The next prime is 77938691947. The reversal of 77938691929 is 92919683977.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (77938691911) and next prime (77938691947).

It is not a de Polignac number, because 77938691929 - 2¹³ = 77938683737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77938691629) 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, 11288739 + ... + 11295640.

It is an arithmetic number, because the mean of its divisors is an integer number (6097782600).

Almost surely, 2^77938691929 is an apocalyptic number.

It is an amenable number.

77938691929 is a deficient number, since it is larger than the sum of its proper divisors (19625829671).

77938691929 is a wasteful number, since it uses less digits than its factorization.

77938691929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22584432.

The product of its digits is 92588832, while the sum is 70.

The spelling of 77938691929 in words is "seventy-seven billion, nine hundred thirty-eight million, six hundred ninety-one thousand, nine hundred twenty-nine".