77820530 has 16 divisors (see below), whose sum is σ = 141851520. Its totient is φ = 30733872.

The previous prime is 77820529. The next prime is 77820539. The reversal of 77820530 is 3502877.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (77820539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48464 + ... + 50043.

It is an arithmetic number, because the mean of its divisors is an integer number (8865720).

Almost surely, 2^77820530 is an apocalyptic number.

77820530 is a deficient number, since it is larger than the sum of its proper divisors (64030990).

77820530 is a wasteful number, since it uses less digits than its factorization.

77820530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98593.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 77820530 is about 8821.5945270682. The cubic root of 77820530 is about 426.9379182011.

The spelling of 77820530 in words is "seventy-seven million, eight hundred twenty thousand, five hundred thirty".