6662778 has 16 divisors (see below), whose sum is σ = 13905216. Its totient is φ = 2124320.

The previous prime is 6662771. The next prime is 6662809. The reversal of 6662778 is 8772666.

It is a super-2 number, since 2×6662778² = 88785221354568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6662771) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 24003 + ... + 24278.

It is an arithmetic number, because the mean of its divisors is an integer number (869076).

Almost surely, 2^6662778 is an apocalyptic number.

6662778 is an abundant number, since it is smaller than the sum of its proper divisors (7242438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6662778 is a wasteful number, since it uses less digits than its factorization.

6662778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48309.

The product of its digits is 169344, while the sum is 42.

The square root of 6662778 is about 2581.2357505660. The cubic root of 6662778 is about 188.1706049045.

The spelling of 6662778 in words is "six million, six hundred sixty-two thousand, seven hundred seventy-eight".