66873720 has 32 divisors (see below), whose sum is σ = 200621520. Its totient is φ = 17832960.

The previous prime is 66873691. The next prime is 66873721. The reversal of 66873720 is 2737866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66873721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278521 + ... + 278760.

Almost surely, 2^66873720 is an apocalyptic number.

66873720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66873720 is an abundant number, since it is smaller than the sum of its proper divisors (133747800).

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

66873720 is a wasteful number, since it uses less digits than its factorization.

66873720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557295 (or 557291 counting only the distinct ones).

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

The square root of 66873720 is about 8177.6353550400. The cubic root of 66873720 is about 405.8994792679.

The spelling of 66873720 in words is "sixty-six million, eight hundred seventy-three thousand, seven hundred twenty".