77457728511 has 12 divisors (see below), whose sum is σ = 111902151192. Its totient is φ = 51629824656.

The previous prime is 77457728501. The next prime is 77457728549. The reversal of 77457728511 is 11582775477.

77457728511 is a `hidden beast` number, since 7 + 7 + 4 + 57 + 72 + 8 + 511 = 666.

It is not a de Polignac number, because 77457728511 - 2¹⁷ = 77457597439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77457728501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 664876 + ... + 772641.

It is an arithmetic number, because the mean of its divisors is an integer number (9325179266).

Almost surely, 2^77457728511 is an apocalyptic number.

77457728511 is a deficient number, since it is larger than the sum of its proper divisors (34444422681).

77457728511 is a wasteful number, since it uses less digits than its factorization.

77457728511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443510 (or 1443507 counting only the distinct ones).

The product of its digits is 3841600, while the sum is 54.

The spelling of 77457728511 in words is "seventy-seven billion, four hundred fifty-seven million, seven hundred twenty-eight thousand, five hundred eleven".