77728724504785 has 8 divisors (see below), whose sum is σ = 93274682935680. Its totient is φ = 62182837250544.

The previous prime is 77728724504773. The next prime is 77728724504801. The reversal of 77728724504785 is 58740542782777.

77728724504785 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 77728724504785 - 2¹³ = 77728724496593 is a prime.

It is a super-2 number, since 2×77728724504785² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15361407 + ... + 19784596.

It is an arithmetic number, because the mean of its divisors is an integer number (11659335366960).

Almost surely, 2^{77728724504785} is an apocalyptic number.

It is an amenable number.

77728724504785 is a deficient number, since it is larger than the sum of its proper divisors (15545958430895).

77728724504785 is a wasteful number, since it uses less digits than its factorization.

77728724504785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35588327.

The product of its (nonzero) digits is 1721036800, while the sum is 73.

The spelling of 77728724504785 in words is "seventy-seven trillion, seven hundred twenty-eight billion, seven hundred twenty-four million, five hundred four thousand, seven hundred eighty-five".