78509743 has 4 divisors (see below), whose sum is σ = 84548968. Its totient is φ = 72470520.

The previous prime is 78509737. The next prime is 78509747. The reversal of 78509743 is 34790587.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78509743 - 2¹³ = 78501551 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78509743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78509747) 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, 3019593 + ... + 3019618.

It is an arithmetic number, because the mean of its divisors is an integer number (21137242).

Almost surely, 2^78509743 is an apocalyptic number.

78509743 is a deficient number, since it is larger than the sum of its proper divisors (6039225).

78509743 is a wasteful number, since it uses less digits than its factorization.

78509743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6039224.

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

The square root of 78509743 is about 8860.5723855742. The cubic root of 78509743 is about 428.1945991809.

The spelling of 78509743 in words is "seventy-eight million, five hundred nine thousand, seven hundred forty-three".