667734528 has 160 divisors (see below), whose sum is σ = 1905628032. Its totient is φ = 207257600.

The previous prime is 667734527. The next prime is 667734539. The reversal of 667734528 is 825437766.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (667734527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1448218 + ... + 1448678.

Almost surely, 2^667734528 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667734528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (952814016).

667734528 is an abundant number, since it is smaller than the sum of its proper divisors (1237893504).

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

667734528 is a wasteful number, since it uses less digits than its factorization.

667734528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546 (or 530 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 48.

The square root of 667734528 is about 25840.5597462594. The cubic root of 667734528 is about 874.0466473156.

The spelling of 667734528 in words is "six hundred sixty-seven million, seven hundred thirty-four thousand, five hundred twenty-eight".