78356039981 has 8 divisors (see below), whose sum is σ = 81899337600. Its totient is φ = 74824118512.

The previous prime is 78356039963. The next prime is 78356040001. The reversal of 78356039981 is 18993065387.

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

It is not a de Polignac number, because 78356039981 - 2⁶ = 78356039917 is a prime.

It is a super-2 number, since 2×78356039981² (a number of 23 digits) contains 22 as substring.

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 78356039981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78356039581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2829950 + ... + 2857503.

It is an arithmetic number, because the mean of its divisors is an integer number (10237417200).

Almost surely, 2^78356039981 is an apocalyptic number.

It is an amenable number.

78356039981 is a deficient number, since it is larger than the sum of its proper divisors (3543297619).

78356039981 is a wasteful number, since it uses less digits than its factorization.

78356039981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5688075.

The product of its (nonzero) digits is 9797760, while the sum is 59.

The spelling of 78356039981 in words is "seventy-eight billion, three hundred fifty-six million, thirty-nine thousand, nine hundred eighty-one".