77639743 has 6 divisors (see below), whose sum is σ = 81162704. Its totient is φ = 74263596.

The previous prime is 77639729. The next prime is 77639761. The reversal of 77639743 is 34793677.

It is not a de Polignac number, because 77639743 - 2⁹ = 77639231 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77639693 and 77639702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77639543) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72855 + ... + 73912.

Almost surely, 2^77639743 is an apocalyptic number.

77639743 is a deficient number, since it is larger than the sum of its proper divisors (3522961).

77639743 is a wasteful number, since it uses less digits than its factorization.

77639743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146813 (or 146790 counting only the distinct ones).

The product of its digits is 666792, while the sum is 46.

The square root of 77639743 is about 8811.3417252993. The cubic root of 77639743 is about 426.6070514717.

The spelling of 77639743 in words is "seventy-seven million, six hundred thirty-nine thousand, seven hundred forty-three".