667059840 has 128 divisors (see below), whose sum is σ = 2362564800. Its totient is φ = 177878016.

The previous prime is 667059781. The next prime is 667059851. The reversal of 667059840 is 48950766.

It is a tau number, because it is divible by the number of its divisors (128).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2022 + ... + 36581.

Almost surely, 2^667059840 is an apocalyptic number.

667059840 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 667059840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1181282400).

667059840 is an abundant number, since it is smaller than the sum of its proper divisors (1695504960).

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

667059840 is a wasteful number, since it uses less digits than its factorization.

667059840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38631 (or 38613 counting only the distinct ones).

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

The square root of 667059840 is about 25827.5016213338. The cubic root of 667059840 is about 873.7521652583.

The spelling of 667059840 in words is "six hundred sixty-seven million, fifty-nine thousand, eight hundred forty".