78378622739 has 8 divisors (see below), whose sum is σ = 80975510400. Its totient is φ = 75786019200.

The previous prime is 78378622717. The next prime is 78378622793. The reversal of 78378622739 is 93722687387.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78378622739 is a prime.

It is a super-2 number, since 2×78378622739² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78378622709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1033814 + ... + 1107035.

It is an arithmetic number, because the mean of its divisors is an integer number (10121938800).

Almost surely, 2^78378622739 is an apocalyptic number.

78378622739 is a deficient number, since it is larger than the sum of its proper divisors (2596887661).

78378622739 is a wasteful number, since it uses less digits than its factorization.

78378622739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2142061.

The product of its digits is 42674688, while the sum is 62.

The spelling of 78378622739 in words is "seventy-eight billion, three hundred seventy-eight million, six hundred twenty-two thousand, seven hundred thirty-nine".