77550920 has 16 divisors (see below), whose sum is σ = 174489660. Its totient is φ = 31020352.

The previous prime is 77550919. The next prime is 77550937. The reversal of 77550920 is 2905577.

It can be written as a sum of positive squares in 2 ways, for example, as 73856836 + 3694084 = 8594^2 + 1922^2 .

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 3 ways as a sum of consecutive naturals, for example, 969347 + ... + 969426.

Almost surely, 2^77550920 is an apocalyptic number.

It is an amenable number.

77550920 is an abundant number, since it is smaller than the sum of its proper divisors (96938740).

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

77550920 is a wasteful number, since it uses less digits than its factorization.

77550920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1938784 (or 1938780 counting only the distinct ones).

The product of its (nonzero) digits is 22050, while the sum is 35.

The square root of 77550920 is about 8806.3000176010. The cubic root of 77550920 is about 426.4443041636. Note that the first 3 decimals are identical.

The spelling of 77550920 in words is "seventy-seven million, five hundred fifty thousand, nine hundred twenty".