77681940982 has 8 divisors (see below), whose sum is σ = 116793267552. Its totient is φ = 38750851800.

The previous prime is 77681940949. The next prime is 77681940983. The reversal of 77681940982 is 28904918677.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×77681940982² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77681940982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77681940983) 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, 45058269 + ... + 45059992.

It is an arithmetic number, because the mean of its divisors is an integer number (14599158444).

Almost surely, 2^77681940982 is an apocalyptic number.

77681940982 is a deficient number, since it is larger than the sum of its proper divisors (39111326570).

77681940982 is a wasteful number, since it uses less digits than its factorization.

77681940982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90118694.

The product of its (nonzero) digits is 12192768, while the sum is 61.

The spelling of 77681940982 in words is "seventy-seven billion, six hundred eighty-one million, nine hundred forty thousand, nine hundred eighty-two".