66669372 has 96 divisors (see below), whose sum is σ = 215523840. Its totient is φ = 17314560.

The previous prime is 66669371. The next prime is 66669409. The reversal of 66669372 is 27396666.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66669371) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4308 + ... + 12324.

It is an arithmetic number, because the mean of its divisors is an integer number (2245040).

Almost surely, 2^66669372 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66669372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107761920).

66669372 is an abundant number, since it is smaller than the sum of its proper divisors (148854468).

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

66669372 is a wasteful number, since it uses less digits than its factorization.

66669372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8048 (or 8040 counting only the distinct ones).

The product of its digits is 489888, while the sum is 45.

The square root of 66669372 is about 8165.1314747529. The cubic root of 66669372 is about 405.4856177586.

The spelling of 66669372 in words is "sixty-six million, six hundred sixty-nine thousand, three hundred seventy-two".