64630566 has 192 divisors, whose sum is σ = 200019456. Its totient is φ = 14515200.

The previous prime is 64630541. The next prime is 64630603. The reversal of 64630566 is 66503646.

64630566 is a `hidden beast` number, since 64 + 6 + 30 + 566 = 666.

It is a super-2 number, since 2×64630566² = 8354220122960712, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64630566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 306201 + ... + 306411.

It is an arithmetic number, because the mean of its divisors is an integer number (1041768).

Almost surely, 2^64630566 is an apocalyptic number.

64630566 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 64630566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100009728).

64630566 is an abundant number, since it is smaller than the sum of its proper divisors (135388890).

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

64630566 is a wasteful number, since it uses less digits than its factorization.

64630566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267 (or 264 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The square root of 64630566 is about 8039.3137766852. The cubic root of 64630566 is about 401.3093882458.

Subtracting 64630566 from its reverse (66503646), we obtain a triangular number (1873080 = T₁₉₃₅).

The spelling of 64630566 in words is "sixty-four million, six hundred thirty thousand, five hundred sixty-six".