77745544 has 8 divisors (see below), whose sum is σ = 145772910. Its totient is φ = 38872768.

The previous prime is 77745529. The next prime is 77745581. The reversal of 77745544 is 44554777.

It can be written as a sum of positive squares in only one way, i.e., 76212900 + 1532644 = 8730^2 + 1238^2 .

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

It is a super-2 number, since 2×77745544² = 12088739223711872, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77745544.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4859089 + ... + 4859104.

Almost surely, 2^77745544 is an apocalyptic number.

It is an amenable number.

77745544 is a deficient number, since it is larger than the sum of its proper divisors (68027366).

77745544 is a wasteful number, since it uses less digits than its factorization.

77745544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9718199 (or 9718195 counting only the distinct ones).

The product of its digits is 548800, while the sum is 43.

The square root of 77745544 is about 8817.3433640751. The cubic root of 77745544 is about 426.8007450798.

The spelling of 77745544 in words is "seventy-seven million, seven hundred forty-five thousand, five hundred forty-four".