667592640 has 336 divisors, whose sum is σ = 2699345376. Its totient is φ = 149299200.

The previous prime is 667592621. The next prime is 667592671. The reversal of 667592640 is 46295766.

667592640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 411030 + ... + 412650.

It is an arithmetic number, because the mean of its divisors is an integer number (8033766).

Almost surely, 2^667592640 is an apocalyptic number.

667592640 is a gapful number since it is divisible by the number (60) 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 667592640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1349672688).

667592640 is an abundant number, since it is smaller than the sum of its proper divisors (2031752736).

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

667592640 is a wasteful number, since it uses less digits than its factorization.

667592640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1668 (or 1655 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The square root of 667592640 is about 25837.8141490336. The cubic root of 667592640 is about 873.9847337303.

The spelling of 667592640 in words is "six hundred sixty-seven million, five hundred ninety-two thousand, six hundred forty".