660259872 has 72 divisors (see below), whose sum is σ = 1988076636. Its totient is φ = 207138816.

The previous prime is 660259867. The next prime is 660259921. The reversal of 660259872 is 278952066.

It can be written as a sum of positive squares in 2 ways, for example, as 651474576 + 8785296 = 25524^2 + 2964^2 .

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

It is a congruent number.

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, 62533 + ... + 72324.

Almost surely, 2^660259872 is an apocalyptic number.

It is an amenable number.

660259872 is an abundant number, since it is smaller than the sum of its proper divisors (1327816764).

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

660259872 is a wasteful number, since it uses less digits than its factorization.

660259872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134890 (or 134879 counting only the distinct ones).

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

The square root of 660259872 is about 25695.5224115020. The cubic root of 660259872 is about 870.7730267668.

The spelling of 660259872 in words is "six hundred sixty million, two hundred fifty-nine thousand, eight hundred seventy-two".