66875928 has 64 divisors (see below), whose sum is σ = 197253120. Its totient is φ = 18489600.

The previous prime is 66875917. The next prime is 66875933. The reversal of 66875928 is 82957866.

It is a super-2 number, since 2×66875928² = 8944779491722368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1213 + ... + 11628.

It is an arithmetic number, because the mean of its divisors is an integer number (3082080).

Almost surely, 2^66875928 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 66875928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98626560).

66875928 is an abundant number, since it is smaller than the sum of its proper divisors (130377192).

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

66875928 is a wasteful number, since it uses less digits than its factorization.

66875928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12888 (or 12884 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 51.

The square root of 66875928 is about 8177.7703562768. The cubic root of 66875928 is about 405.9039464746.

The spelling of 66875928 in words is "sixty-six million, eight hundred seventy-five thousand, nine hundred twenty-eight".