66551028 has 24 divisors (see below), whose sum is σ = 155437632. Its totient is φ = 22161984.

The previous prime is 66550993. The next prime is 66551041. The reversal of 66551028 is 82015566.

66551028 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

66551028 is strictly pandigital in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 66551028.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14376 + ... + 18432.

It is an arithmetic number, because the mean of its divisors is an integer number (6476568).

Almost surely, 2^66551028 is an apocalyptic number.

It is an amenable number.

66551028 is an abundant number, since it is smaller than the sum of its proper divisors (88886604).

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

66551028 is a wasteful number, since it uses less digits than its factorization.

66551028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5431 (or 5429 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 66551028 is about 8157.8813426036. The cubic root of 66551028 is about 405.2455514427.

The spelling of 66551028 in words is "sixty-six million, five hundred fifty-one thousand, twenty-eight".