77773144 has 8 divisors (see below), whose sum is σ = 145824660. Its totient is φ = 38886568.

The previous prime is 77773139. The next prime is 77773153. The reversal of 77773144 is 44137777.

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 = 77773097 and 77773106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4860814 + ... + 4860829.

Almost surely, 2^77773144 is an apocalyptic number.

It is an amenable number.

77773144 is a deficient number, since it is larger than the sum of its proper divisors (68051516).

77773144 is a wasteful number, since it uses less digits than its factorization.

77773144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9721649 (or 9721645 counting only the distinct ones).

The product of its digits is 115248, while the sum is 40.

The square root of 77773144 is about 8818.9083224626. The cubic root of 77773144 is about 426.8512444666.

The spelling of 77773144 in words is "seventy-seven million, seven hundred seventy-three thousand, one hundred forty-four".