667375540 has 24 divisors (see below), whose sum is σ = 1509296040. Its totient is φ = 246415488.

The previous prime is 667375537. The next prime is 667375601. The reversal of 667375540 is 45573766.

It can be written as a sum of positive squares in 4 ways, for example, as 124858276 + 542517264 = 11174^2 + 23292^2 .

It is a super-2 number, since 2×667375540² = 890780222780583200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1283155 + ... + 1283674.

It is an arithmetic number, because the mean of its divisors is an integer number (62887335).

Almost surely, 2^667375540 is an apocalyptic number.

It is an amenable number.

667375540 is an abundant number, since it is smaller than the sum of its proper divisors (841920500).

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

667375540 is a wasteful number, since it uses less digits than its factorization.

667375540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2566851 (or 2566849 counting only the distinct ones).

The product of its (nonzero) digits is 529200, while the sum is 43.

The square root of 667375540 is about 25833.6126006410. The cubic root of 667375540 is about 873.8899840052.

The spelling of 667375540 in words is "six hundred sixty-seven million, three hundred seventy-five thousand, five hundred forty".