66136640 has 112 divisors (see below), whose sum is σ = 166786560. Its totient is φ = 24944640.

The previous prime is 66136621. The next prime is 66136657. The reversal of 66136640 is 4663166.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 66136597 and 66136606.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 585224 + ... + 585336.

Almost surely, 2^66136640 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 66136640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83393280).

66136640 is an abundant number, since it is smaller than the sum of its proper divisors (100649920).

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

66136640 is a wasteful number, since it uses less digits than its factorization.

66136640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 210 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 66136640 is about 8132.4436671888. The cubic root of 66136640 is about 404.4026962055.

The spelling of 66136640 in words is "sixty-six million, one hundred thirty-six thousand, six hundred forty".