77608420 has 12 divisors (see below), whose sum is σ = 162977724. Its totient is φ = 31043360.

The previous prime is 77608393. The next prime is 77608429. The reversal of 77608420 is 2480677.

It can be written as a sum of positive squares in 2 ways, for example, as 26543104 + 51065316 = 5152^2 + 7146^2 .

It is not an unprimeable number, because it can be changed into a prime (77608429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1940191 + ... + 1940230.

It is an arithmetic number, because the mean of its divisors is an integer number (13581477).

Almost surely, 2^77608420 is an apocalyptic number.

It is an amenable number.

77608420 is an abundant number, since it is smaller than the sum of its proper divisors (85369304).

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

77608420 is a wasteful number, since it uses less digits than its factorization.

77608420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3880430 (or 3880428 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 77608420 is about 8809.5641208859. The cubic root of 77608420 is about 426.5496735981.

The spelling of 77608420 in words is "seventy-seven million, six hundred eight thousand, four hundred twenty".