77438105 has 4 divisors (see below), whose sum is σ = 92925732. Its totient is φ = 61950480.

The previous prime is 77438083. The next prime is 77438173. The reversal of 77438105 is 50183477.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50183477 = 571 ⋅87887.

It can be written as a sum of positive squares in 2 ways, for example, as 37356544 + 40081561 = 6112^2 + 6331^2 .

It is not a de Polignac number, because 77438105 - 2¹⁸ = 77175961 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7743806 + ... + 7743815.

It is an arithmetic number, because the mean of its divisors is an integer number (23231433).

Almost surely, 2^77438105 is an apocalyptic number.

It is an amenable number.

77438105 is a deficient number, since it is larger than the sum of its proper divisors (15487627).

77438105 is a wasteful number, since it uses less digits than its factorization.

77438105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15487626.

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 77438105 is about 8799.8923288868. The cubic root of 77438105 is about 426.2374178941.

The spelling of 77438105 in words is "seventy-seven million, four hundred thirty-eight thousand, one hundred five".