64864620 has 72 divisors (see below), whose sum is σ = 197988336. Its totient is φ = 17188992.

The previous prime is 64864607. The next prime is 64864649. The reversal of 64864620 is 2646846.

It is a happy number.

64864620 is a `hidden beast` number, since 6 + 4 + 8 + 646 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30099 + ... + 32181.

It is an arithmetic number, because the mean of its divisors is an integer number (2749838).

Almost surely, 2^64864620 is an apocalyptic number.

64864620 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 64864620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98994168).

64864620 is an abundant number, since it is smaller than the sum of its proper divisors (133123716).

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

64864620 is a wasteful number, since it uses less digits than its factorization.

64864620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2271 (or 2266 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The square root of 64864620 is about 8053.8574608693. The cubic root of 64864620 is about 401.7932403754.

The spelling of 64864620 in words is "sixty-four million, eight hundred sixty-four thousand, six hundred twenty".