77065540 has 24 divisors (see below), whose sum is σ = 162028440. Its totient is φ = 30789888.

The previous prime is 77065531. The next prime is 77065559. The reversal of 77065540 is 4556077.

It can be written as a sum of positive squares in 4 ways, for example, as 9036036 + 68029504 = 3006^2 + 8248^2 .

It is a junction number, because it is equal to n+sod(n) for n = 77065496 and 77065505.

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, 20874 + ... + 24286.

It is an arithmetic number, because the mean of its divisors is an integer number (6751185).

Almost surely, 2^77065540 is an apocalyptic number.

It is an amenable number.

77065540 is an abundant number, since it is smaller than the sum of its proper divisors (84962900).

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

77065540 is a wasteful number, since it uses less digits than its factorization.

77065540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4551 (or 4549 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 34.

The square root of 77065540 is about 8778.6980811508. The cubic root of 77065540 is about 425.5527571249.

The spelling of 77065540 in words is "seventy-seven million, sixty-five thousand, five hundred forty".