77940981730 has 16 divisors (see below), whose sum is σ = 141604925760. Its totient is φ = 30885024112.

The previous prime is 77940981691. The next prime is 77940981731. The reversal of 77940981730 is 3718904977.

It is not an unprimeable number, because it can be changed into a prime (77940981731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36419950 + ... + 36422089.

It is an arithmetic number, because the mean of its divisors is an integer number (8850307860).

Almost surely, 2^77940981730 is an apocalyptic number.

77940981730 is a deficient number, since it is larger than the sum of its proper divisors (63663944030).

77940981730 is a wasteful number, since it uses less digits than its factorization.

77940981730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72842153.

The product of its (nonzero) digits is 2667168, while the sum is 55.

The spelling of 77940981730 in words is "seventy-seven billion, nine hundred forty million, nine hundred eighty-one thousand, seven hundred thirty".