77878043 has 4 divisors (see below), whose sum is σ = 77942640. Its totient is φ = 77813448.

The previous prime is 77878039. The next prime is 77878103. The reversal of 77878043 is 34087877.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34087877 = 349 ⋅97673.

It is a cyclic number.

It is not a de Polignac number, because 77878043 - 2² = 77878039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77877985 and 77878003.

It is not an unprimeable number, because it can be changed into a prime (77878033) 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, 30455 + ... + 32912.

It is an arithmetic number, because the mean of its divisors is an integer number (19485660).

Almost surely, 2^77878043 is an apocalyptic number.

77878043 is a deficient number, since it is larger than the sum of its proper divisors (64597).

77878043 is a wasteful number, since it uses less digits than its factorization.

77878043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64596.

The product of its (nonzero) digits is 263424, while the sum is 44.

The square root of 77878043 is about 8824.8537098356. The cubic root of 77878043 is about 427.0430679776.

The spelling of 77878043 in words is "seventy-seven million, eight hundred seventy-eight thousand, forty-three".