77550980 has 48 divisors (see below), whose sum is σ = 176070720. Its totient is φ = 28522368.

The previous prime is 77550971. The next prime is 77550997. The reversal of 77550980 is 8905577.

It is a happy number.

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 15 ways as a sum of consecutive naturals, for example, 98147 + ... + 98933.

It is an arithmetic number, because the mean of its divisors is an integer number (3668140).

Almost surely, 2^77550980 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77550980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88035360).

77550980 is an abundant number, since it is smaller than the sum of its proper divisors (98519740).

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

77550980 is a wasteful number, since it uses less digits than its factorization.

77550980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1188 (or 1186 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 41.

The square root of 77550980 is about 8806.3034242524. The cubic root of 77550980 is about 426.4444141415. Note that the first 4 decimals are identical.

The spelling of 77550980 in words is "seventy-seven million, five hundred fifty thousand, nine hundred eighty".