66021672 has 16 divisors (see below), whose sum is σ = 165054240. Its totient is φ = 22007216.

The previous prime is 66021671. The next prime is 66021673. The reversal of 66021672 is 27612066.

It is an interprime number because it is at equal distance from previous prime (66021671) and next prime (66021673).

It is a super-3 number, since 3×66021672³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (66021671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1375428 + ... + 1375475.

It is an arithmetic number, because the mean of its divisors is an integer number (10315890).

Almost surely, 2^66021672 is an apocalyptic number.

It is an amenable number.

66021672 is an abundant number, since it is smaller than the sum of its proper divisors (99032568).

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

66021672 is a wasteful number, since it uses less digits than its factorization.

66021672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2750912 (or 2750908 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 66021672 is about 8125.3721145557. The cubic root of 66021672 is about 404.1682304305.

The spelling of 66021672 in words is "sixty-six million, twenty-one thousand, six hundred seventy-two".