77694749678 has 32 divisors (see below), whose sum is σ = 144316494336. Its totient is φ = 30547806048.

The previous prime is 77694749659. The next prime is 77694749689. The reversal of 77694749678 is 87694749677.

It is a super-2 number, since 2×77694749678² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1279826 + ... + 1339157.

It is an arithmetic number, because the mean of its divisors is an integer number (4509890448).

Almost surely, 2^77694749678 is an apocalyptic number.

77694749678 is a deficient number, since it is larger than the sum of its proper divisors (66621744658).

77694749678 is a wasteful number, since it uses less digits than its factorization.

77694749678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2619168.

The product of its digits is 896168448, while the sum is 74.

Subtracting 77694749678 from its reverse (87694749677), we obtain a palindrome (9999999999).

The spelling of 77694749678 in words is "seventy-seven billion, six hundred ninety-four million, seven hundred forty-nine thousand, six hundred seventy-eight".