66361428 has 72 divisors (see below), whose sum is σ = 194463360. Its totient is φ = 18688320.

The previous prime is 66361403. The next prime is 66361441. The reversal of 66361428 is 82416366.

66361428 is a `hidden beast` number, since 6 + 636 + 14 + 2 + 8 = 666.

66361428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 66361392 and 66361401.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16038 + ... + 19746.

It is an arithmetic number, because the mean of its divisors is an integer number (2700880).

Almost surely, 2^66361428 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 66361428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97231680).

66361428 is an abundant number, since it is smaller than the sum of its proper divisors (128101932).

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

66361428 is a wasteful number, since it uses less digits than its factorization.

66361428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3797 (or 3792 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 66361428 is about 8146.2523899030. The cubic root of 66361428 is about 404.8603450815.

The spelling of 66361428 in words is "sixty-six million, three hundred sixty-one thousand, four hundred twenty-eight".