77308530 has 64 divisors (see below), whose sum is σ = 210349440. Its totient is φ = 18026496.

The previous prime is 77308529. The next prime is 77308541. The reversal of 77308530 is 3580377.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 77308491 and 77308500.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 2194 + ... + 12626.

It is an arithmetic number, because the mean of its divisors is an integer number (3286710).

Almost surely, 2^77308530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77308530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105174720).

77308530 is an abundant number, since it is smaller than the sum of its proper divisors (133040910).

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

77308530 is a wasteful number, since it uses less digits than its factorization.

77308530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10475.

The product of its (nonzero) digits is 17640, while the sum is 33.

The square root of 77308530 is about 8792.5269405331. The cubic root of 77308530 is about 425.9995481491. Note that the first 3 decimals are identical.

The spelling of 77308530 in words is "seventy-seven million, three hundred eight thousand, five hundred thirty".