66087560 has 128 divisors (see below), whose sum is σ = 190080000. Its totient is φ = 20079360.

The previous prime is 66087559. The next prime is 66087589. The reversal of 66087560 is 6578066.

66087560 = T₅₁₃₉ + T₅₁₄₀ + ... + T₅₁₄₃.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 132191 + ... + 132689.

It is an arithmetic number, because the mean of its divisors is an integer number (1485000).

Almost surely, 2^66087560 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66087560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95040000).

66087560 is an abundant number, since it is smaller than the sum of its proper divisors (123992440).

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

66087560 is a wasteful number, since it uses less digits than its factorization.

66087560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571 (or 567 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 66087560 is about 8129.4255639621. The cubic root of 66087560 is about 404.3026357040.

The spelling of 66087560 in words is "sixty-six million, eighty-seven thousand, five hundred sixty".