78494671 has 4 divisors (see below), whose sum is σ = 78831792. Its totient is φ = 78157552.

The previous prime is 78494657. The next prime is 78494683. The reversal of 78494671 is 17649487.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78494671 - 2⁵ = 78494639 is a prime.

It is a super-2 number, since 2×78494671² = 12322826750796482, 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 (78494641) 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, 168211 + ... + 168676.

It is an arithmetic number, because the mean of its divisors is an integer number (19707948).

Almost surely, 2^78494671 is an apocalyptic number.

78494671 is a deficient number, since it is larger than the sum of its proper divisors (337121).

78494671 is a wasteful number, since it uses less digits than its factorization.

78494671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337120.

The product of its digits is 338688, while the sum is 46.

The square root of 78494671 is about 8859.7218353626. The cubic root of 78494671 is about 428.1671963737.

The spelling of 78494671 in words is "seventy-eight million, four hundred ninety-four thousand, six hundred seventy-one".