77144473 has 8 divisors (see below), whose sum is σ = 89964800. Its totient is φ = 66123540.

The previous prime is 77144471. The next prime is 77144489. The reversal of 77144473 is 37444177.

It is not a de Polignac number, because 77144473 - 2¹ = 77144471 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77144471) 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 7 ways as a sum of consecutive naturals, for example, 112113 + ... + 112798.

It is an arithmetic number, because the mean of its divisors is an integer number (11245600).

Almost surely, 2^77144473 is an apocalyptic number.

It is an amenable number.

77144473 is a deficient number, since it is larger than the sum of its proper divisors (12820327).

77144473 is an equidigital number, since it uses as much as digits as its factorization.

77144473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224932 (or 224918 counting only the distinct ones).

The product of its digits is 65856, while the sum is 37.

The square root of 77144473 is about 8783.1926427695. The cubic root of 77144473 is about 425.6979958151.

The spelling of 77144473 in words is "seventy-seven million, one hundred forty-four thousand, four hundred seventy-three".