77121880 has 32 divisors (see below), whose sum is σ = 189300240. Its totient is φ = 28044160.

The previous prime is 77121871. The next prime is 77121901. The reversal of 77121880 is 8812177.

It is a congruent number.

It is an unprimeable number.

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, 87199 + ... + 88078.

Almost surely, 2^77121880 is an apocalyptic number.

It is an amenable number.

77121880 is an abundant number, since it is smaller than the sum of its proper divisors (112178360).

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

77121880 is a wasteful number, since it uses less digits than its factorization.

77121880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175299 (or 175295 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 34.

The square root of 77121880 is about 8781.9063989546. The cubic root of 77121880 is about 425.6564342553.

The spelling of 77121880 in words is "seventy-seven million, one hundred twenty-one thousand, eight hundred eighty".