81877714 has 4 divisors (see below), whose sum is σ = 122816574. Its totient is φ = 40938856.

The previous prime is 81877699. The next prime is 81877717. The reversal of 81877714 is 41777818.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 41777818 = 2 ⋅20888909.

It can be written as a sum of positive squares in only one way, i.e., 59552089 + 22325625 = 7717^2 + 4725^2 .

It is not an unprimeable number, because it can be changed into a prime (81877717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20469427 + ... + 20469430.

Almost surely, 2^81877714 is an apocalyptic number.

81877714 is a deficient number, since it is larger than the sum of its proper divisors (40938860).

81877714 is a wasteful number, since it uses less digits than its factorization.

81877714 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40938859.

The product of its digits is 87808, while the sum is 43.

The square root of 81877714 is about 9048.6305041150. The cubic root of 81877714 is about 434.2320780181.

The spelling of 81877714 in words is "eighty-one million, eight hundred seventy-seven thousand, seven hundred fourteen".