78471853 has 4 divisors (see below), whose sum is σ = 79952508. Its totient is φ = 76991200.

The previous prime is 78471851. The next prime is 78471859. The reversal of 78471853 is 35817487.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35817487 = 17 ⋅2106911.

It can be written as a sum of positive squares in 2 ways, for example, as 21650409 + 56821444 = 4653^2 + 7538^2 .

It is a cyclic number.

It is not a de Polignac number, because 78471853 - 2¹ = 78471851 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 (78471851) 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, 740248 + ... + 740353.

It is an arithmetic number, because the mean of its divisors is an integer number (19988127).

Almost surely, 2^78471853 is an apocalyptic number.

It is an amenable number.

78471853 is a deficient number, since it is larger than the sum of its proper divisors (1480655).

78471853 is a wasteful number, since it uses less digits than its factorization.

78471853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1480654.

The product of its digits is 188160, while the sum is 43.

The square root of 78471853 is about 8858.4340038181. The cubic root of 78471853 is about 428.1257036804.

The spelling of 78471853 in words is "seventy-eight million, four hundred seventy-one thousand, eight hundred fifty-three".