78327853 has 4 divisors (see below), whose sum is σ = 80444860. Its totient is φ = 76210848.

The previous prime is 78327841. The next prime is 78327859. The reversal of 78327853 is 35872387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35872387 = 23 ⋅1559669.

It can be written as a sum of positive squares in 2 ways, for example, as 41822089 + 36505764 = 6467^2 + 6042^2 .

It is a cyclic number.

It is not a de Polignac number, because 78327853 - 2⁹ = 78327341 is a prime.

It is a super-2 number, since 2×78327853² = 12270505111179218, 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 (78327859) 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, 1058448 + ... + 1058521.

It is an arithmetic number, because the mean of its divisors is an integer number (20111215).

Almost surely, 2^78327853 is an apocalyptic number.

It is an amenable number.

78327853 is a deficient number, since it is larger than the sum of its proper divisors (2117007).

78327853 is a wasteful number, since it uses less digits than its factorization.

78327853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2117006.

The product of its digits is 282240, while the sum is 43.

The square root of 78327853 is about 8850.3024242113. The cubic root of 78327853 is about 427.8636655616.

The spelling of 78327853 in words is "seventy-eight million, three hundred twenty-seven thousand, eight hundred fifty-three".