77540530 has 16 divisors (see below), whose sum is σ = 143345880. Its totient is φ = 30177792.

The previous prime is 77540513. The next prime is 77540531. The reversal of 77540530 is 3504577.

It can be written as a sum of positive squares in 4 ways, for example, as 53304601 + 24235929 = 7301^2 + 4923^2 .

It is a junction number, because it is equal to n+sod(n) for n = 77540492 and 77540501.

It is not an unprimeable number, because it can be changed into a prime (77540531) 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, 104415 + ... + 105154.

Almost surely, 2^77540530 is an apocalyptic number.

77540530 is a deficient number, since it is larger than the sum of its proper divisors (65805350).

77540530 is a wasteful number, since it uses less digits than its factorization.

77540530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209613.

The product of its (nonzero) digits is 14700, while the sum is 31.

The square root of 77540530 is about 8805.7100792611. The cubic root of 77540530 is about 426.4252588095.

The spelling of 77540530 in words is "seventy-seven million, five hundred forty thousand, five hundred thirty".