77328666 has 24 divisors (see below), whose sum is σ = 167718720. Its totient is φ = 25749576.

The previous prime is 77328661. The next prime is 77328673. The reversal of 77328666 is 66682377.

It is not an unprimeable number, because it can be changed into a prime (77328661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24105 + ... + 27123.

It is an arithmetic number, because the mean of its divisors is an integer number (6988280).

Almost surely, 2^77328666 is an apocalyptic number.

77328666 is an abundant number, since it is smaller than the sum of its proper divisors (90390054).

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

77328666 is a wasteful number, since it uses less digits than its factorization.

77328666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4450 (or 4447 counting only the distinct ones).

The product of its digits is 508032, while the sum is 45.

The square root of 77328666 is about 8793.6719292910. The cubic root of 77328666 is about 426.0365306238.

The spelling of 77328666 in words is "seventy-seven million, three hundred twenty-eight thousand, six hundred sixty-six".