660654628 has 12 divisors (see below), whose sum is σ = 1159794972. Its totient is φ = 329284640.

The previous prime is 660654619. The next prime is 660654637. The reversal of 660654628 is 826456066.

It is an interprime number because it is at equal distance from previous prime (660654619) and next prime (660654637).

It can be written as a sum of positive squares in 2 ways, for example, as 147088384 + 513566244 = 12128^2 + 22662^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259243 + ... + 261778.

It is an arithmetic number, because the mean of its divisors is an integer number (96649581).

Almost surely, 2^660654628 is an apocalyptic number.

It is an amenable number.

660654628 is a deficient number, since it is larger than the sum of its proper divisors (499140344).

660654628 is a wasteful number, since it uses less digits than its factorization.

660654628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521342 (or 521340 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 43.

The square root of 660654628 is about 25703.2026798218. The cubic root of 660654628 is about 870.9465313764.

The spelling of 660654628 in words is "six hundred sixty million, six hundred fifty-four thousand, six hundred twenty-eight".