78497743 has 4 divisors (see below), whose sum is σ = 78520528. Its totient is φ = 78474960.

The previous prime is 78497729. The next prime is 78497761. The reversal of 78497743 is 34779487.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34779487 = 443 ⋅78509.

It is a cyclic number.

It is not a de Polignac number, because 78497743 - 2⁵ = 78497711 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78417743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5046 + ... + 13507.

It is an arithmetic number, because the mean of its divisors is an integer number (19630132).

Almost surely, 2^78497743 is an apocalyptic number.

78497743 is a deficient number, since it is larger than the sum of its proper divisors (22785).

78497743 is a wasteful number, since it uses less digits than its factorization.

78497743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22784.

The product of its digits is 1185408, while the sum is 49.

The square root of 78497743 is about 8859.8952025405. The cubic root of 78497743 is about 428.1727819439.

The spelling of 78497743 in words is "seventy-eight million, four hundred ninety-seven thousand, seven hundred forty-three".