667736064 has 144 divisors (see below), whose sum is σ = 2042946360. Its totient is φ = 209387520.

The previous prime is 667736011. The next prime is 667736089. The reversal of 667736064 is 460637766.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 312279 + ... + 314409.

Almost surely, 2^667736064 is an apocalyptic number.

667736064 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 667736064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1021473180).

667736064 is an abundant number, since it is smaller than the sum of its proper divisors (1375210296).

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

667736064 is a wasteful number, since it uses less digits than its factorization.

667736064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2176 (or 2153 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 45.

The square root of 667736064 is about 25840.5894669607. The cubic root of 667736064 is about 874.0473175094.

The spelling of 667736064 in words is "six hundred sixty-seven million, seven hundred thirty-six thousand, sixty-four".