55778719 has 4 divisors (see below), whose sum is σ = 55891000. Its totient is φ = 55666440.

The previous prime is 55778713. The next prime is 55778729. The reversal of 55778719 is 91787755.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55778719 - 2¹¹ = 55776671 is a prime.

It is a super-2 number, since 2×55778719² = 6222530986561922, 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 (55778713) 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, 55392 + ... + 56389.

It is an arithmetic number, because the mean of its divisors is an integer number (13972750).

Almost surely, 2^55778719 is an apocalyptic number.

55778719 is a deficient number, since it is larger than the sum of its proper divisors (112281).

55778719 is a wasteful number, since it uses less digits than its factorization.

55778719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112280.

The product of its digits is 617400, while the sum is 49.

The square root of 55778719 is about 7468.5151804090. The cubic root of 55778719 is about 382.0816483459.

The spelling of 55778719 in words is "fifty-five million, seven hundred seventy-eight thousand, seven hundred nineteen".