77445128 has 8 divisors (see below), whose sum is σ = 145209630. Its totient is φ = 38722560.

The previous prime is 77445127. The next prime is 77445133. The reversal of 77445128 is 82154477.

It can be written as a sum of positive squares in only one way, i.e., 75307684 + 2137444 = 8678^2 + 1462^2 .

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 = 77445091 and 77445100.

It is not an unprimeable number, because it can be changed into a prime (77445127) 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 as a sum of consecutive naturals, namely, 4840313 + ... + 4840328.

Almost surely, 2^77445128 is an apocalyptic number.

It is an amenable number.

77445128 is a deficient number, since it is larger than the sum of its proper divisors (67764502).

77445128 is a wasteful number, since it uses less digits than its factorization.

77445128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9680647 (or 9680643 counting only the distinct ones).

The product of its digits is 62720, while the sum is 38.

The square root of 77445128 is about 8800.2913588131. The cubic root of 77445128 is about 426.2503029154.

The spelling of 77445128 in words is "seventy-seven million, four hundred forty-five thousand, one hundred twenty-eight".