78711671 has 4 divisors (see below), whose sum is σ = 78756672. Its totient is φ = 78666672.

The previous prime is 78711653. The next prime is 78711701. The reversal of 78711671 is 17611787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17611787 = 29 ⋅607303.

It is a cyclic number.

It is not a de Polignac number, because 78711671 - 2¹⁰ = 78710647 is a prime.

It is a super-2 number, since 2×78711671² = 12391054303224482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78711631) 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, 19766 + ... + 23411.

It is an arithmetic number, because the mean of its divisors is an integer number (19689168).

Almost surely, 2^78711671 is an apocalyptic number.

78711671 is a deficient number, since it is larger than the sum of its proper divisors (45001).

78711671 is a wasteful number, since it uses less digits than its factorization.

78711671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45000.

The product of its digits is 16464, while the sum is 38.

The square root of 78711671 is about 8871.9598173121. The cubic root of 78711671 is about 428.5613921089.

The spelling of 78711671 in words is "seventy-eight million, seven hundred eleven thousand, six hundred seventy-one".