78460729 has 4 divisors (see below), whose sum is σ = 83076084. Its totient is φ = 73845376.

The previous prime is 78460717. The next prime is 78460771. The reversal of 78460729 is 92706487.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92706487 = 53 ⋅1749179.

It can be written as a sum of positive squares in 2 ways, for example, as 50126400 + 28334329 = 7080^2 + 5323^2 .

It is a cyclic number.

It is not a de Polignac number, because 78460729 - 2⁷ = 78460601 is a prime.

It is a super-2 number, since 2×78460729² = 12312171990422882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78460229) 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, 2307652 + ... + 2307685.

It is an arithmetic number, because the mean of its divisors is an integer number (20769021).

Almost surely, 2^78460729 is an apocalyptic number.

It is an amenable number.

78460729 is a deficient number, since it is larger than the sum of its proper divisors (4615355).

78460729 is a wasteful number, since it uses less digits than its factorization.

78460729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4615354.

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 78460729 is about 8857.8061053514. The cubic root of 78460729 is about 428.1054726668.

The spelling of 78460729 in words is "seventy-eight million, four hundred sixty thousand, seven hundred twenty-nine".