66621632 has 84 divisors (see below), whose sum is σ = 166207440. Its totient is φ = 25935360.

The previous prime is 66621617. The next prime is 66621641. The reversal of 66621632 is 23612666.

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

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 11 ways as a sum of consecutive naturals, for example, 53594 + ... + 54822.

It is an arithmetic number, because the mean of its divisors is an integer number (1978660).

Almost surely, 2^66621632 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 66621632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83103720).

66621632 is an abundant number, since it is smaller than the sum of its proper divisors (99585808).

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

66621632 is a wasteful number, since it uses less digits than its factorization.

66621632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270 (or 1249 counting only the distinct ones).

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

The square root of 66621632 is about 8162.2075445311. The cubic root of 66621632 is about 405.3888091583.

The spelling of 66621632 in words is "sixty-six million, six hundred twenty-one thousand, six hundred thirty-two".