66299620 has 12 divisors (see below), whose sum is σ = 139229244. Its totient is φ = 26519840.

The previous prime is 66299617. The next prime is 66299621. The reversal of 66299620 is 2699266.

It can be written as a sum of positive squares in 2 ways, for example, as 37161216 + 29138404 = 6096^2 + 5398^2 .

It is a super-2 number, since 2×66299620² = 8791279224288800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66299621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1657471 + ... + 1657510.

It is an arithmetic number, because the mean of its divisors is an integer number (11602437).

Almost surely, 2^66299620 is an apocalyptic number.

It is an amenable number.

66299620 is an abundant number, since it is smaller than the sum of its proper divisors (72929624).

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

66299620 is a wasteful number, since it uses less digits than its factorization.

66299620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3314990 (or 3314988 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 66299620 is about 8142.4578598848. The cubic root of 66299620 is about 404.7346124993.

The spelling of 66299620 in words is "sixty-six million, two hundred ninety-nine thousand, six hundred twenty".