78704626381 has 4 divisors (see below), whose sum is σ = 79232845500. Its totient is φ = 78176407264.

The previous prime is 78704626379. The next prime is 78704626409. The reversal of 78704626381 is 18362640787.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24785464356 + 53919162025 = 157434^2 + 232205^2 .

It is a cyclic number.

It is not a de Polignac number, because 78704626381 - 2¹ = 78704626379 is a prime.

It is a super-2 number, since 2×78704626381² (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 (78704621381) 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 3 ways as a sum of consecutive naturals, for example, 264109336 + ... + 264109633.

It is an arithmetic number, because the mean of its divisors is an integer number (19808211375).

Almost surely, 2^78704626381 is an apocalyptic number.

It is an amenable number.

78704626381 is a deficient number, since it is larger than the sum of its proper divisors (528219119).

78704626381 is a wasteful number, since it uses less digits than its factorization.

78704626381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528219118.

The product of its (nonzero) digits is 2709504, while the sum is 52.

The spelling of 78704626381 in words is "seventy-eight billion, seven hundred four million, six hundred twenty-six thousand, three hundred eighty-one".