64666020 has 96 divisors (see below), whose sum is σ = 188084736. Its totient is φ = 16588800.

The previous prime is 64666013. The next prime is 64666033. The reversal of 64666020 is 2066646.

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

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, 238485 + ... + 238755.

It is an arithmetic number, because the mean of its divisors is an integer number (1959216).

Almost surely, 2^64666020 is an apocalyptic number.

64666020 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 64666020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94042368).

64666020 is an abundant number, since it is smaller than the sum of its proper divisors (123418716).

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

64666020 is a wasteful number, since it uses less digits than its factorization.

64666020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421 (or 419 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 64666020 is about 8041.5185133158. The cubic root of 64666020 is about 401.3827561224.

It can be divided in two parts, 646 and 66020, that added together give a palindrome (66666).

The spelling of 64666020 in words is "sixty-four million, six hundred sixty-six thousand, twenty".