78670127921 has 8 divisors (see below), whose sum is σ = 98082237504. Its totient is φ = 61301398320.

The previous prime is 78670127917. The next prime is 78670127927. The reversal of 78670127921 is 12972107687.

It is a happy number.

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 78670127921 - 2² = 78670127917 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 78670127921.

It is not an unprimeable number, because it can be changed into a prime (78670127927) 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, 510844910 + ... + 510845063.

It is an arithmetic number, because the mean of its divisors is an integer number (12260279688).

Almost surely, 2^78670127921 is an apocalyptic number.

It is an amenable number.

78670127921 is a deficient number, since it is larger than the sum of its proper divisors (19412109583).

78670127921 is a wasteful number, since it uses less digits than its factorization.

78670127921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021689991.

The product of its (nonzero) digits is 592704, while the sum is 50.

The spelling of 78670127921 in words is "seventy-eight billion, six hundred seventy million, one hundred twenty-seven thousand, nine hundred twenty-one".