66987438 has 32 divisors (see below), whose sum is σ = 153377280. Its totient is φ = 19106400.

The previous prime is 66987343. The next prime is 66987439. The reversal of 66987438 is 83478966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66987439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34288 + ... + 36188.

It is an arithmetic number, because the mean of its divisors is an integer number (4793040).

Almost surely, 2^66987438 is an apocalyptic number.

66987438 is an abundant number, since it is smaller than the sum of its proper divisors (86389842).

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

66987438 is a wasteful number, since it uses less digits than its factorization.

66987438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2752.

The product of its digits is 1741824, while the sum is 51.

The square root of 66987438 is about 8184.5853896212. The cubic root of 66987438 is about 406.1294247927.

The spelling of 66987438 in words is "sixty-six million, nine hundred eighty-seven thousand, four hundred thirty-eight".