5551778 has 4 divisors (see below), whose sum is σ = 8327670. Its totient is φ = 2775888.

The previous prime is 5551757. The next prime is 5551783. The reversal of 5551778 is 8771555.

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

It can be written as a sum of positive squares in only one way, i.e., 3411409 + 2140369 = 1847^2 + 1463^2 .

It is a super-2 number, since 2×5551778² = 61644477922568, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1387943 + ... + 1387946.

Almost surely, 2^5551778 is an apocalyptic number.

5551778 is a deficient number, since it is larger than the sum of its proper divisors (2775892).

5551778 is a wasteful number, since it uses less digits than its factorization.

5551778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2775891.

The product of its digits is 49000, while the sum is 38.

The square root of 5551778 is about 2356.2211271441. The cubic root of 5551778 is about 177.0696099107.

The spelling of 5551778 in words is "five million, five hundred fifty-one thousand, seven hundred seventy-eight".