77066644 has 12 divisors (see below), whose sum is σ = 142800084. Its totient is φ = 36266624.

The previous prime is 77066573. The next prime is 77066653. The reversal of 77066644 is 44666077.

It can be written as a sum of positive squares in 2 ways, for example, as 70358544 + 6708100 = 8388^2 + 2590^2 .

It is a junction number, because it is equal to n+sod(n) for n = 77066597 and 77066606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 566599 + ... + 566734.

It is an arithmetic number, because the mean of its divisors is an integer number (11900007).

Almost surely, 2^77066644 is an apocalyptic number.

It is an amenable number.

77066644 is a deficient number, since it is larger than the sum of its proper divisors (65733440).

77066644 is a wasteful number, since it uses less digits than its factorization.

77066644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133354 (or 1133352 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 40.

The square root of 77066644 is about 8778.7609604089. The cubic root of 77066644 is about 425.5547891961.

The spelling of 77066644 in words is "seventy-seven million, sixty-six thousand, six hundred forty-four".