78096239821 has 4 divisors (see below), whose sum is σ = 78102702432. Its totient is φ = 78089777212.

The previous prime is 78096239813. The next prime is 78096239839. The reversal of 78096239821 is 12893269087.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78096239821 - 2³ = 78096239813 is a prime.

It is a super-2 number, since 2×78096239821² (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 (78096239861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3213145 + ... + 3237358.

It is an arithmetic number, because the mean of its divisors is an integer number (19525675608).

Almost surely, 2^78096239821 is an apocalyptic number.

It is an amenable number.

78096239821 is a deficient number, since it is larger than the sum of its proper divisors (6462611).

78096239821 is a wasteful number, since it uses less digits than its factorization.

78096239821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6462610.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 78096239821 in words is "seventy-eight billion, ninety-six million, two hundred thirty-nine thousand, eight hundred twenty-one".