77868890 has 32 divisors (see below), whose sum is σ = 153964800. Its totient is φ = 28120000.

The previous prime is 77868887. The next prime is 77868911. The reversal of 77868890 is 9886877.

It is a Curzon 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, 14015 + ... + 18765.

It is an arithmetic number, because the mean of its divisors is an integer number (4811400).

Almost surely, 2^77868890 is an apocalyptic number.

77868890 is a deficient number, since it is larger than the sum of its proper divisors (76095910).

77868890 is a wasteful number, since it uses less digits than its factorization.

77868890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4918.

The product of its (nonzero) digits is 1354752, while the sum is 53.

The square root of 77868890 is about 8824.3351024312. The cubic root of 77868890 is about 427.0263372099.

The spelling of 77868890 in words is "seventy-seven million, eight hundred sixty-eight thousand, eight hundred ninety".