77664730 has 32 divisors (see below), whose sum is σ = 164239488. Its totient is φ = 26068800.

The previous prime is 77664679. The next prime is 77664731. The reversal of 77664730 is 3746677.

It is not an unprimeable number, because it can be changed into a prime (77664731) 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 15 ways as a sum of consecutive naturals, for example, 25726 + ... + 28585.

It is an arithmetic number, because the mean of its divisors is an integer number (5132484).

Almost surely, 2^77664730 is an apocalyptic number.

77664730 is an abundant number, since it is smaller than the sum of its proper divisors (86574758).

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

77664730 is a wasteful number, since it uses less digits than its factorization.

77664730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54342.

The product of its (nonzero) digits is 148176, while the sum is 40.

The square root of 77664730 is about 8812.7594997254. The cubic root of 77664730 is about 426.6528119145.

It can be divided in two parts, 776647 and 30, that added together give a palindrome (776677).

The spelling of 77664730 in words is "seventy-seven million, six hundred sixty-four thousand, seven hundred thirty".