78343801 has 4 divisors (see below), whose sum is σ = 78554212. Its totient is φ = 78133392.

The previous prime is 78343787. The next prime is 78343813. The reversal of 78343801 is 10834387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10834387 = 71 ⋅152597.

It can be written as a sum of positive squares in 2 ways, for example, as 42055225 + 36288576 = 6485^2 + 6024^2 .

It is a cyclic number.

It is not a de Polignac number, because 78343801 - 2¹⁵ = 78311033 is a prime.

It is a super-2 number, since 2×78343801² = 12275502310255202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78343841) 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, 104646 + ... + 105391.

It is an arithmetic number, because the mean of its divisors is an integer number (19638553).

Almost surely, 2^78343801 is an apocalyptic number.

It is an amenable number.

78343801 is a deficient number, since it is larger than the sum of its proper divisors (210411).

78343801 is a wasteful number, since it uses less digits than its factorization.

78343801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210410.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 78343801 is about 8851.2033645149. The cubic root of 78343801 is about 427.8927020896.

The spelling of 78343801 in words is "seventy-eight million, three hundred forty-three thousand, eight hundred one".