77389555 has 4 divisors (see below), whose sum is σ = 92867472. Its totient is φ = 61911640.

The previous prime is 77389531. The next prime is 77389561. The reversal of 77389555 is 55598377.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55598377 = 107 ⋅519611.

It is not a de Polignac number, because 77389555 - 2⁵ = 77389523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77389499 and 77389508.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7738951 + ... + 7738960.

It is an arithmetic number, because the mean of its divisors is an integer number (23216868).

Almost surely, 2^77389555 is an apocalyptic number.

77389555 is a deficient number, since it is larger than the sum of its proper divisors (15477917).

77389555 is a wasteful number, since it uses less digits than its factorization.

77389555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15477916.

The product of its digits is 1323000, while the sum is 49.

The square root of 77389555 is about 8797.1333399011. The cubic root of 77389555 is about 426.1483224252.

The spelling of 77389555 in words is "seventy-seven million, three hundred eighty-nine thousand, five hundred fifty-five".