77221608 has 32 divisors (see below), whose sum is σ = 196222560. Its totient is φ = 25318080.

The previous prime is 77221591. The next prime is 77221621. The reversal of 77221608 is 80612277.

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 7 ways as a sum of consecutive naturals, for example, 24910 + ... + 27837.

It is an arithmetic number, because the mean of its divisors is an integer number (6131955).

Almost surely, 2^77221608 is an apocalyptic number.

It is an amenable number.

77221608 is an abundant number, since it is smaller than the sum of its proper divisors (119000952).

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

77221608 is a wasteful number, since it uses less digits than its factorization.

77221608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52817 (or 52813 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 77221608 is about 8787.5826027412. The cubic root of 77221608 is about 425.8398304605.

The spelling of 77221608 in words is "seventy-seven million, two hundred twenty-one thousand, six hundred eight".