66270270 has 64 divisors (see below), whose sum is σ = 174286080. Its totient is φ = 15993600.

The previous prime is 66270263. The next prime is 66270287. The reversal of 66270270 is 7207266.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 134725 + ... + 135215.

It is an arithmetic number, because the mean of its divisors is an integer number (2723220).

Almost surely, 2^66270270 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66270270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87143040).

66270270 is an abundant number, since it is smaller than the sum of its proper divisors (108015810).

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

66270270 is a wasteful number, since it uses less digits than its factorization.

66270270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921.

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 66270270 is about 8140.6553790220. The cubic root of 66270270 is about 404.6748800594.

It can be divided in two parts, 66270 and 270, that multiplied together give a square (17892900 = 4230²).

The spelling of 66270270 in words is "sixty-six million, two hundred seventy thousand, two hundred seventy".