77481871 has 4 divisors (see below), whose sum is σ = 80850672. Its totient is φ = 74113072.

The previous prime is 77481863. The next prime is 77481883. The reversal of 77481871 is 17818477.

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: 17818477 = 41 ⋅434597.

It is a cyclic number.

It is not a de Polignac number, because 77481871 - 2³ = 77481863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77481851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1684366 + ... + 1684411.

It is an arithmetic number, because the mean of its divisors is an integer number (20212668).

Almost surely, 2^77481871 is an apocalyptic number.

77481871 is a deficient number, since it is larger than the sum of its proper divisors (3368801).

77481871 is a wasteful number, since it uses less digits than its factorization.

77481871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3368800.

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

The square root of 77481871 is about 8802.3787125981. The cubic root of 77481871 is about 426.3177022001.

The spelling of 77481871 in words is "seventy-seven million, four hundred eighty-one thousand, eight hundred seventy-one".