78376781 has 8 divisors (see below), whose sum is σ = 89629824. Its totient is φ = 67137840.

The previous prime is 78376733. The next prime is 78376787. The reversal of 78376781 is 18767387.

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

It is not a de Polignac number, because 78376781 - 2¹⁰ = 78375757 is a prime.

It is a super-2 number, since 2×78376781² = 12285839599843922, which 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 (78376787) 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, 14651 + ... + 19271.

It is an arithmetic number, because the mean of its divisors is an integer number (11203728).

Almost surely, 2^78376781 is an apocalyptic number.

It is an amenable number.

78376781 is a deficient number, since it is larger than the sum of its proper divisors (11253043).

78376781 is a wasteful number, since it uses less digits than its factorization.

78376781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7051.

The product of its digits is 395136, while the sum is 47.

The square root of 78376781 is about 8853.0661920038. The cubic root of 78376781 is about 427.9527362867.

The spelling of 78376781 in words is "seventy-eight million, three hundred seventy-six thousand, seven hundred eighty-one".