77481128 has 8 divisors (see below), whose sum is σ = 145277130. Its totient is φ = 38740560.

The previous prime is 77481119. The next prime is 77481167. The reversal of 77481128 is 82118477.

It can be written as a sum of positive squares in only one way, i.e., 77123524 + 357604 = 8782^2 + 598^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 77481091 and 77481100.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4842563 + ... + 4842578.

Almost surely, 2^77481128 is an apocalyptic number.

It is an amenable number.

77481128 is a deficient number, since it is larger than the sum of its proper divisors (67796002).

77481128 is a wasteful number, since it uses less digits than its factorization.

77481128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9685147 (or 9685143 counting only the distinct ones).

The product of its digits is 25088, while the sum is 38.

The square root of 77481128 is about 8802.3365079960. The cubic root of 77481128 is about 426.3163394940.

The spelling of 77481128 in words is "seventy-seven million, four hundred eighty-one thousand, one hundred twenty-eight".