667284544 has 56 divisors (see below), whose sum is σ = 1406274048. Its totient is φ = 313067520.

The previous prime is 667284539. The next prime is 667284571. The reversal of 667284544 is 445482766.

It is a happy number.

It is a super-2 number, since 2×667284544² = 890537325322575872, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 667284494 and 667284503.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 468217 + ... + 469639.

Almost surely, 2^667284544 is an apocalyptic number.

667284544 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667284544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (703137024).

667284544 is an abundant number, since it is smaller than the sum of its proper divisors (738989504).

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

667284544 is a wasteful number, since it uses less digits than its factorization.

667284544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1883 (or 1873 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 46.

The square root of 667284544 is about 25831.8513467386. The cubic root of 667284544 is about 873.8502641860.

The spelling of 667284544 in words is "six hundred sixty-seven million, two hundred eighty-four thousand, five hundred forty-four".