56783819 has 4 divisors (see below), whose sum is σ = 56916000. Its totient is φ = 56651640.

The previous prime is 56783777. The next prime is 56783833. The reversal of 56783819 is 91838765.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91838765 = 5 ⋅18367753.

It is a cyclic number.

It is not a de Polignac number, because 56783819 - 2⁸ = 56783563 is a prime.

It is a super-2 number, since 2×56783819² = 6448804200449522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56783879) 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, 65444 + ... + 66305.

It is an arithmetic number, because the mean of its divisors is an integer number (14229000).

Almost surely, 2^56783819 is an apocalyptic number.

56783819 is a deficient number, since it is larger than the sum of its proper divisors (132181).

56783819 is a wasteful number, since it uses less digits than its factorization.

56783819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132180.

The product of its digits is 362880, while the sum is 47.

The square root of 56783819 is about 7535.5038982141. The cubic root of 56783819 is about 384.3629629297.

The spelling of 56783819 in words is "fifty-six million, seven hundred eighty-three thousand, eight hundred nineteen".