66673940 has 12 divisors (see below), whose sum is σ = 140015316. Its totient is φ = 26669568.

The previous prime is 66673939. The next prime is 66673961. The reversal of 66673940 is 4937666.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 25867396 + 40806544 = 5086^2 + 6388^2 .

It is a hoax number, since the sum of its digits (41) 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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1666829 + ... + 1666868.

It is an arithmetic number, because the mean of its divisors is an integer number (11667943).

Almost surely, 2^66673940 is an apocalyptic number.

It is an amenable number.

66673940 is an abundant number, since it is smaller than the sum of its proper divisors (73341376).

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

66673940 is a wasteful number, since it uses less digits than its factorization.

66673940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3333706 (or 3333704 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 41.

The square root of 66673940 is about 8165.4111960146. The cubic root of 66673940 is about 405.4948784628.

The spelling of 66673940 in words is "sixty-six million, six hundred seventy-three thousand, nine hundred forty".