78294240309 has 8 divisors (see below), whose sum is σ = 105862635072. Its totient is φ = 51461002880.

The previous prime is 78294240293. The next prime is 78294240337. The reversal of 78294240309 is 90304249287.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78294240309 - 2⁴ = 78294240293 is a prime.

It is a super-2 number, since 2×78294240309² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78294247309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183789084 + ... + 183789509.

It is an arithmetic number, because the mean of its divisors is an integer number (13232829384).

Almost surely, 2^78294240309 is an apocalyptic number.

It is an amenable number.

78294240309 is a deficient number, since it is larger than the sum of its proper divisors (27568394763).

78294240309 is a wasteful number, since it uses less digits than its factorization.

78294240309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367578667.

The product of its (nonzero) digits is 870912, while the sum is 48.

The spelling of 78294240309 in words is "seventy-eight billion, two hundred ninety-four million, two hundred forty thousand, three hundred nine".