78055819 has 8 divisors (see below), whose sum is σ = 82250240. Its totient is φ = 73870056.

The previous prime is 78055811. The next prime is 78055837. The reversal of 78055819 is 91855087.

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 78055819 - 2³ = 78055811 is a prime.

It is a super-2 number, since 2×78055819² = 12185421759521522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78055811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25594 + ... + 28480.

It is an arithmetic number, because the mean of its divisors is an integer number (10281280).

Almost surely, 2^78055819 is an apocalyptic number.

78055819 is a deficient number, since it is larger than the sum of its proper divisors (4194421).

78055819 is a wasteful number, since it uses less digits than its factorization.

78055819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4329.

The product of its (nonzero) digits is 100800, while the sum is 43.

The square root of 78055819 is about 8834.9204297492. The cubic root of 78055819 is about 427.3677650357.

The spelling of 78055819 in words is "seventy-eight million, fifty-five thousand, eight hundred nineteen".