66984087 has 16 divisors (see below), whose sum is σ = 92418048. Its totient is φ = 43110240.

The previous prime is 66984079. The next prime is 66984089. The reversal of 66984087 is 78048966.

It is not a de Polignac number, because 66984087 - 2³ = 66984079 is a prime.

It is a super-2 number, since 2×66984087² = 8973735822447138, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66984089) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60178 + ... + 61280.

It is an arithmetic number, because the mean of its divisors is an integer number (5776128).

Almost surely, 2^66984087 is an apocalyptic number.

66984087 is a deficient number, since it is larger than the sum of its proper divisors (25433961).

66984087 is a wasteful number, since it uses less digits than its factorization.

66984087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1790.

The product of its (nonzero) digits is 580608, while the sum is 48.

The square root of 66984087 is about 8184.3806729648. The cubic root of 66984087 is about 406.1226525658.

The spelling of 66984087 in words is "sixty-six million, nine hundred eighty-four thousand, eighty-seven".