77027720647 has 8 divisors (see below), whose sum is σ = 81752496912. Its totient is φ = 72324470400.

The previous prime is 77027720603. The next prime is 77027720677. The reversal of 77027720647 is 74602772077.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77027720647 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77027720647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77027720677) 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, 5374129 + ... + 5388442.

It is an arithmetic number, because the mean of its divisors is an integer number (10219062114).

Almost surely, 2^77027720647 is an apocalyptic number.

77027720647 is a deficient number, since it is larger than the sum of its proper divisors (4724776265).

77027720647 is a wasteful number, since it uses less digits than its factorization.

77027720647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10763009.

The product of its (nonzero) digits is 1613472, while the sum is 49.

The spelling of 77027720647 in words is "seventy-seven billion, twenty-seven million, seven hundred twenty thousand, six hundred forty-seven".