66628023 has 16 divisors (see below), whose sum is σ = 110758656. Its totient is φ = 34611840.

The previous prime is 66628019. The next prime is 66628031. The reversal of 66628023 is 32082666.

It is not a de Polignac number, because 66628023 - 2² = 66628019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66628063) 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, 143986 + ... + 144447.

It is an arithmetic number, because the mean of its divisors is an integer number (6922416).

Almost surely, 2^66628023 is an apocalyptic number.

66628023 is a deficient number, since it is larger than the sum of its proper divisors (44130633).

66628023 is a wasteful number, since it uses less digits than its factorization.

66628023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288454.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 66628023 is about 8162.5990346213. The cubic root of 66628023 is about 405.4017716999.

The spelling of 66628023 in words is "sixty-six million, six hundred twenty-eight thousand, twenty-three".