66020712 has 64 divisors (see below), whose sum is σ = 170449920. Its totient is φ = 21298368.

The previous prime is 66020693. The next prime is 66020719. The reversal of 66020712 is 21702066.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (66020719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120423 + ... + 120969.

It is an arithmetic number, because the mean of its divisors is an integer number (2663280).

Almost surely, 2^66020712 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 66020712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85224960).

66020712 is an abundant number, since it is smaller than the sum of its proper divisors (104429208).

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

66020712 is a wasteful number, since it uses less digits than its factorization.

66020712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710 (or 706 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 66020712 is about 8125.3130401234. The cubic root of 66020712 is about 404.1662714607.

Adding to 66020712 its reverse (21702066), we get a palindrome (87722778).

The spelling of 66020712 in words is "sixty-six million, twenty thousand, seven hundred twelve".