66047487 has 24 divisors (see below), whose sum is σ = 98651952. Its totient is φ = 39262080.

The previous prime is 66047473. The next prime is 66047489. The reversal of 66047487 is 78474066.

It is not a de Polignac number, because 66047487 - 2¹² = 66043391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66047489) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17523 + ... + 20955.

It is an arithmetic number, because the mean of its divisors is an integer number (4110498).

Almost surely, 2^66047487 is an apocalyptic number.

66047487 is a deficient number, since it is larger than the sum of its proper divisors (32604465).

66047487 is a wasteful number, since it uses less digits than its factorization.

66047487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3511 (or 3500 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 42.

The square root of 66047487 is about 8126.9605019343. The cubic root of 66047487 is about 404.2209012328.

The spelling of 66047487 in words is "sixty-six million, forty-seven thousand, four hundred eighty-seven".