77220291731680 has 48 divisors (see below), whose sum is σ = 182433613494384. Its totient is φ = 30888002529280.

The previous prime is 77220291731663. The next prime is 77220291731683. The reversal of 77220291731680 is 8613719202277.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77220291731683) 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, 52484139 + ... + 53935381.

It is an arithmetic number, because the mean of its divisors is an integer number (3800700281133).

Almost surely, 2^{77220291731680} is an apocalyptic number.

It is an amenable number.

77220291731680 is an abundant number, since it is smaller than the sum of its proper divisors (105213321762704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77220291731680 is a wasteful number, since it uses less digits than its factorization.

77220291731680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1783819 (or 1783811 counting only the distinct ones).

The product of its (nonzero) digits is 3556224, while the sum is 55.

The spelling of 77220291731680 in words is "seventy-seven trillion, two hundred twenty billion, two hundred ninety-one million, seven hundred thirty-one thousand, six hundred eighty".