77509444 has 6 divisors (see below), whose sum is σ = 135641534. Its totient is φ = 38754720.

The previous prime is 77509433. The next prime is 77509447. The reversal of 77509444 is 44490577.

It can be written as a sum of positive squares in only one way, i.e., 59105344 + 18404100 = 7688^2 + 4290^2 .

It is a junction number, because it is equal to n+sod(n) for n = 77509397 and 77509406.

It is not an unprimeable number, because it can be changed into a prime (77509447) by changing a digit.

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 as a sum of consecutive naturals, namely, 9688677 + ... + 9688684.

Almost surely, 2^77509444 is an apocalyptic number.

It is an amenable number.

77509444 is a deficient number, since it is larger than the sum of its proper divisors (58132090).

77509444 is a wasteful number, since it uses less digits than its factorization.

77509444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19377365 (or 19377363 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 40.

The square root of 77509444 is about 8803.9447976461. The cubic root of 77509444 is about 426.3682665612.

The spelling of 77509444 in words is "seventy-seven million, five hundred nine thousand, four hundred forty-four".