78809925839 has 8 divisors (see below), whose sum is σ = 80731276032. Its totient is φ = 76892601240.

The previous prime is 78809925823. The next prime is 78809925853. The reversal of 78809925839 is 93852990887.

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 78809925839 - 2⁴ = 78809925823 is a prime.

It is a super-2 number, since 2×78809925839² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78809925809) 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, 966749 + ... + 1045094.

It is an arithmetic number, because the mean of its divisors is an integer number (10091409504).

Almost surely, 2^78809925839 is an apocalyptic number.

78809925839 is a deficient number, since it is larger than the sum of its proper divisors (1921350193).

78809925839 is a wasteful number, since it uses less digits than its factorization.

78809925839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2012797.

The product of its (nonzero) digits is 78382080, while the sum is 68.

The spelling of 78809925839 in words is "seventy-eight billion, eight hundred nine million, nine hundred twenty-five thousand, eight hundred thirty-nine".