55780558 has 4 divisors (see below), whose sum is σ = 83670840. Its totient is φ = 27890278.

The previous prime is 55780537. The next prime is 55780573. The reversal of 55780558 is 85508755.

55780558 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85508755 = 5 ⋅17101751.

It is a super-3 number, since 3×55780558³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13945138 + ... + 13945141.

It is an arithmetic number, because the mean of its divisors is an integer number (20917710).

Almost surely, 2^55780558 is an apocalyptic number.

55780558 is a deficient number, since it is larger than the sum of its proper divisors (27890282).

55780558 is a wasteful number, since it uses less digits than its factorization.

55780558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27890281.

The product of its (nonzero) digits is 280000, while the sum is 43.

The square root of 55780558 is about 7468.6382962358. The cubic root of 55780558 is about 382.0858473215.

The spelling of 55780558 in words is "fifty-five million, seven hundred eighty thousand, five hundred fifty-eight".