66193220 has 12 divisors (see below), whose sum is σ = 139005804. Its totient is φ = 26477280.

The previous prime is 66193219. The next prime is 66193273. The reversal of 66193220 is 2239166.

It can be written as a sum of positive squares in 2 ways, for example, as 52070656 + 14122564 = 7216^2 + 3758^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1654811 + ... + 1654850.

It is an arithmetic number, because the mean of its divisors is an integer number (11583817).

Almost surely, 2^66193220 is an apocalyptic number.

It is an amenable number.

66193220 is an abundant number, since it is smaller than the sum of its proper divisors (72812584).

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

66193220 is a wasteful number, since it uses less digits than its factorization.

66193220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3309670 (or 3309668 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 66193220 is about 8135.9215827096. The cubic root of 66193220 is about 404.5179857168.

The spelling of 66193220 in words is "sixty-six million, one hundred ninety-three thousand, two hundred twenty".