78671653 has 4 divisors (see below), whose sum is σ = 78720460. Its totient is φ = 78622848.

The previous prime is 78671641. The next prime is 78671669. The reversal of 78671653 is 35617687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35617687 = 7 ⋅5088241.

It can be written as a sum of positive squares in 2 ways, for example, as 13417569 + 65254084 = 3663^2 + 8078^2 .

It is a cyclic number.

It is not a de Polignac number, because 78671653 - 2⁹ = 78671141 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 (78671623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21900 + ... + 25237.

It is an arithmetic number, because the mean of its divisors is an integer number (19680115).

Almost surely, 2^78671653 is an apocalyptic number.

It is an amenable number.

78671653 is a deficient number, since it is larger than the sum of its proper divisors (48807).

78671653 is a wasteful number, since it uses less digits than its factorization.

78671653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48806.

The product of its digits is 211680, while the sum is 43.

The square root of 78671653 is about 8869.7042228025. The cubic root of 78671653 is about 428.4887511360.

It can be divided in two parts, 786716 and 53, that added together give a square (786769 = 887²).

The spelling of 78671653 in words is "seventy-eight million, six hundred seventy-one thousand, six hundred fifty-three".