64416660 has 192 divisors, whose sum is σ = 229146624. Its totient is φ = 13132800.

The previous prime is 64416647. The next prime is 64416673. The reversal of 64416660 is 6661446.

It is an interprime number because it is at equal distance from previous prime (64416647) and next prime (64416673).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 337165 + ... + 337355.

It is an arithmetic number, because the mean of its divisors is an integer number (1193472).

Almost surely, 2^64416660 is an apocalyptic number.

64416660 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 64416660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114573312).

64416660 is an abundant number, since it is smaller than the sum of its proper divisors (164729964).

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

64416660 is a wasteful number, since it uses less digits than its factorization.

64416660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294 (or 292 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 64416660 is about 8025.9990032394. Note that the first 3 decimals coincide. The cubic root of 64416660 is about 400.8661647096.

The spelling of 64416660 in words is "sixty-four million, four hundred sixteen thousand, six hundred sixty".