78471841 has 4 divisors (see below), whose sum is σ = 89682112. Its totient is φ = 67261572.

The previous prime is 78471839. The next prime is 78471851. The reversal of 78471841 is 14817487.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14817487 = 71 ⋅208697.

It is not a de Polignac number, because 78471841 - 2¹ = 78471839 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78471794 and 78471803.

It is not an unprimeable number, because it can be changed into a prime (78471821) 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, 5605125 + ... + 5605138.

It is an arithmetic number, because the mean of its divisors is an integer number (22420528).

Almost surely, 2^78471841 is an apocalyptic number.

It is an amenable number.

78471841 is a deficient number, since it is larger than the sum of its proper divisors (11210271).

78471841 is a wasteful number, since it uses less digits than its factorization.

78471841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11210270.

The product of its digits is 50176, while the sum is 40.

The square root of 78471841 is about 8858.4333264974. The cubic root of 78471841 is about 428.1256818573.

The spelling of 78471841 in words is "seventy-eight million, four hundred seventy-one thousand, eight hundred forty-one".