77478944 has 48 divisors (see below), whose sum is σ = 156202200. Its totient is φ = 37822464.

The previous prime is 77478943. The next prime is 77478949. The reversal of 77478944 is 44987477.

It can be written as a sum of positive squares in 4 ways, for example, as 77228944 + 250000 = 8788^2 + 500^2 .

It is a junction number, because it is equal to n+sod(n) for n = 77478892 and 77478901.

It is not an unprimeable number, because it can be changed into a prime (77478943) 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, 338222 + ... + 338450.

Almost surely, 2^77478944 is an apocalyptic number.

It is an amenable number.

77478944 is an abundant number, since it is smaller than the sum of its proper divisors (78723256).

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

77478944 is a wasteful number, since it uses less digits than its factorization.

77478944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445 (or 437 counting only the distinct ones).

The product of its digits is 1580544, while the sum is 50.

The square root of 77478944 is about 8802.2124491516. The cubic root of 77478944 is about 426.3123338578.

The spelling of 77478944 in words is "seventy-seven million, four hundred seventy-eight thousand, nine hundred forty-four".