78738890867 has 8 divisors (see below), whose sum is σ = 96909404256. Its totient is φ = 62298902592.

The previous prime is 78738890863. The next prime is 78738890891. The reversal of 78738890867 is 76809883787.

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 78738890867 - 2² = 78738890863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78738890867.

It is not an unprimeable number, because it can be changed into a prime (78738890861) 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, 432631178 + ... + 432631359.

It is an arithmetic number, because the mean of its divisors is an integer number (12113675532).

Almost surely, 2^78738890867 is an apocalyptic number.

78738890867 is a deficient number, since it is larger than the sum of its proper divisors (18170513389).

78738890867 is a wasteful number, since it uses less digits than its factorization.

78738890867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865262557.

The product of its (nonzero) digits is 227598336, while the sum is 71.

The spelling of 78738890867 in words is "seventy-eight billion, seven hundred thirty-eight million, eight hundred ninety thousand, eight hundred sixty-seven".