78678026731 has 8 divisors (see below), whose sum is σ = 80404913600. Its totient is φ = 76969414080.

The previous prime is 78678026729. The next prime is 78678026759. The reversal of 78678026731 is 13762087687.

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 78678026731 - 2¹ = 78678026729 is a prime.

It is a super-2 number, since 2×78678026731² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78678024731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4559850 + ... + 4577071.

It is an arithmetic number, because the mean of its divisors is an integer number (10050614200).

Almost surely, 2^78678026731 is an apocalyptic number.

78678026731 is a deficient number, since it is larger than the sum of its proper divisors (1726886869).

78678026731 is a wasteful number, since it uses less digits than its factorization.

78678026731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9137109.

The product of its (nonzero) digits is 4741632, while the sum is 55.

The spelling of 78678026731 in words is "seventy-eight billion, six hundred seventy-eight million, twenty-six thousand, seven hundred thirty-one".