77455680 has 56 divisors (see below), whose sum is σ = 245924832. Its totient is φ = 20654592.

The previous prime is 77455673. The next prime is 77455681. The reversal of 77455680 is 8655477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77455681) 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 7 ways as a sum of consecutive naturals, for example, 39382 + ... + 41301.

Almost surely, 2^77455680 is an apocalyptic number.

It is an amenable number.

77455680 is an abundant number, since it is smaller than the sum of its proper divisors (168469152).

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

77455680 is a wasteful number, since it uses less digits than its factorization.

77455680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80703 (or 80693 counting only the distinct ones).

The product of its (nonzero) digits is 235200, while the sum is 42.

The square root of 77455680 is about 8800.8908639978. The cubic root of 77455680 is about 426.2696610900.

The spelling of 77455680 in words is "seventy-seven million, four hundred fifty-five thousand, six hundred eighty".