78421841293 has 8 divisors (see below), whose sum is σ = 80709460128. Its totient is φ = 76155306864.

The previous prime is 78421841291. The next prime is 78421841297. The reversal of 78421841293 is 39214812487.

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

It is not a de Polignac number, because 78421841293 - 2¹ = 78421841291 is a prime.

It is a super-2 number, since 2×78421841293² (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 (78421841291) 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, 5263555 + ... + 5278432.

It is an arithmetic number, because the mean of its divisors is an integer number (10088682516).

Almost surely, 2^78421841293 is an apocalyptic number.

It is an amenable number.

78421841293 is a deficient number, since it is larger than the sum of its proper divisors (2287618835).

78421841293 is a wasteful number, since it uses less digits than its factorization.

78421841293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10542203.

The product of its digits is 774144, while the sum is 49.

The spelling of 78421841293 in words is "seventy-eight billion, four hundred twenty-one million, eight hundred forty-one thousand, two hundred ninety-three".