667276778 has 16 divisors (see below), whose sum is σ = 1145249280. Its totient is φ = 285639216.

The previous prime is 667276777. The next prime is 667276793. The reversal of 667276778 is 877672766.

It is a super-2 number, since 2×667276778² = 890516596916122568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (667276777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15533 + ... + 39696.

It is an arithmetic number, because the mean of its divisors is an integer number (71578080).

Almost surely, 2^667276778 is an apocalyptic number.

667276778 is a deficient number, since it is larger than the sum of its proper divisors (477972502).

667276778 is a wasteful number, since it uses less digits than its factorization.

667276778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56101.

The product of its digits is 8297856, while the sum is 56.

The square root of 667276778 is about 25831.7010280005. The cubic root of 667276778 is about 873.8468741542.

The spelling of 667276778 in words is "six hundred sixty-seven million, two hundred seventy-six thousand, seven hundred seventy-eight".