64968660 has 108 divisors (see below), whose sum is σ = 202420764. Its totient is φ = 16865280.

The previous prime is 64968647. The next prime is 64968661. The reversal of 64968660 is 6686946.

It can be written as a sum of positive squares in 6 ways, for example, as 26998416 + 37970244 = 5196^2 + 6162^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64968661) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 669732 + ... + 669828.

Almost surely, 2^64968660 is an apocalyptic number.

64968660 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 64968660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101210382).

64968660 is an abundant number, since it is smaller than the sum of its proper divisors (137452104).

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

64968660 is a wasteful number, since it uses less digits than its factorization.

64968660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The square root of 64968660 is about 8060.3138896696. The cubic root of 64968660 is about 402.0079451909.

The spelling of 64968660 in words is "sixty-four million, nine hundred sixty-eight thousand, six hundred sixty".