66773820 has 24 divisors (see below), whose sum is σ = 186966864. Its totient is φ = 17806336.

The previous prime is 66773813. The next prime is 66773843. The reversal of 66773820 is 2837766.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 556389 + ... + 556508.

It is an arithmetic number, because the mean of its divisors is an integer number (7790286).

Almost surely, 2^66773820 is an apocalyptic number.

66773820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66773820 is an abundant number, since it is smaller than the sum of its proper divisors (120193044).

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

66773820 is a wasteful number, since it uses less digits than its factorization.

66773820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112909 (or 1112907 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 39.

The square root of 66773820 is about 8171.5249494816. The cubic root of 66773820 is about 405.6972594899.

The spelling of 66773820 in words is "sixty-six million, seven hundred seventy-three thousand, eight hundred twenty".