77871838 has 16 divisors (see below), whose sum is σ = 127670400. Its totient is φ = 35328600.

The previous prime is 77871821. The next prime is 77871841. The reversal of 77871838 is 83817877.

It is a junction number, because it is equal to n+sod(n) for n = 77871791 and 77871800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9463 + ... + 15661.

It is an arithmetic number, because the mean of its divisors is an integer number (7979400).

Almost surely, 2^77871838 is an apocalyptic number.

77871838 is a deficient number, since it is larger than the sum of its proper divisors (49798562).

77871838 is a wasteful number, since it uses less digits than its factorization.

77871838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6783.

The product of its digits is 526848, while the sum is 49.

The square root of 77871838 is about 8824.5021389311. The cubic root of 77871838 is about 427.0317260019.

The spelling of 77871838 in words is "seventy-seven million, eight hundred seventy-one thousand, eight hundred thirty-eight".