77130444 has 12 divisors (see below), whose sum is σ = 179971064. Its totient is φ = 25710144.

The previous prime is 77130439. The next prime is 77130451. The reversal of 77130444 is 44403177.

It is a tau number, because it is divible by the number of its divisors (12).

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 3 ways as a sum of consecutive naturals, for example, 3213757 + ... + 3213780.

Almost surely, 2^77130444 is an apocalyptic number.

It is an amenable number.

77130444 is an abundant number, since it is smaller than the sum of its proper divisors (102840620).

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

77130444 is a wasteful number, since it uses less digits than its factorization.

77130444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6427544 (or 6427542 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 30.

The square root of 77130444 is about 8782.3939788648. The cubic root of 77130444 is about 425.6721893466.

The spelling of 77130444 in words is "seventy-seven million, one hundred thirty thousand, four hundred forty-four".