77885980 has 24 divisors (see below), whose sum is σ = 164424960. Its totient is φ = 30989760.

The previous prime is 77885957. The next prime is 77885989. The reversal of 77885980 is 8958877.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77885989) 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, 6375 + ... + 14014.

It is an arithmetic number, because the mean of its divisors is an integer number (6851040).

Almost surely, 2^77885980 is an apocalyptic number.

It is an amenable number.

77885980 is an abundant number, since it is smaller than the sum of its proper divisors (86538980).

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

77885980 is a wasteful number, since it uses less digits than its factorization.

77885980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20589 (or 20587 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 52.

The square root of 77885980 is about 8825.3033942182. The cubic root of 77885980 is about 427.0575749578.

The spelling of 77885980 in words is "seventy-seven million, eight hundred eighty-five thousand, nine hundred eighty".