66895620 has 96 divisors (see below), whose sum is σ = 207083520. Its totient is φ = 15999360.

The previous prime is 66895603. The next prime is 66895627. The reversal of 66895620 is 2659866.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (66895627) 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, 51499 + ... + 52781.

It is an arithmetic number, because the mean of its divisors is an integer number (2157120).

Almost surely, 2^66895620 is an apocalyptic number.

66895620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66895620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103541760).

66895620 is an abundant number, since it is smaller than the sum of its proper divisors (140187900).

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

66895620 is a wasteful number, since it uses less digits than its factorization.

66895620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1385 (or 1383 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 66895620 is about 8178.9742633169. The cubic root of 66895620 is about 405.9437828121.

The spelling of 66895620 in words is "sixty-six million, eight hundred ninety-five thousand, six hundred twenty".