667520928 has 72 divisors (see below), whose sum is σ = 1922356800. Its totient is φ = 219682944.

The previous prime is 667520879. The next prime is 667520947. The reversal of 667520928 is 829025766.

667520928 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (72).

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, 8083 + ... + 37421.

It is an arithmetic number, because the mean of its divisors is an integer number (26699400).

Almost surely, 2^667520928 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 667520928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (961178400).

667520928 is an abundant number, since it is smaller than the sum of its proper divisors (1254835872).

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

667520928 is a wasteful number, since it uses less digits than its factorization.

667520928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29434 (or 29423 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 667520928 is about 25836.4263782745. The cubic root of 667520928 is about 873.9534384794.

The spelling of 667520928 in words is "six hundred sixty-seven million, five hundred twenty thousand, nine hundred twenty-eight".