64130820 has 48 divisors (see below), whose sum is σ = 193381440. Its totient is φ = 15785856.

The previous prime is 64130813. The next prime is 64130837. The reversal of 64130820 is 2803146.

It is a happy number.

It is a super-2 number, since 2×64130820² = 8225524147744800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40330 + ... + 41889.

It is an arithmetic number, because the mean of its divisors is an integer number (4028780).

Almost surely, 2^64130820 is an apocalyptic number.

64130820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64130820 is an abundant number, since it is smaller than the sum of its proper divisors (129250620).

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

64130820 is a wasteful number, since it uses less digits than its factorization.

64130820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82244 (or 82242 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 64130820 is about 8008.1720760733. The cubic root of 64130820 is about 400.2723561799.

Adding to 64130820 its reverse (2803146), we get a palindrome (66933966).

The spelling of 64130820 in words is "sixty-four million, one hundred thirty thousand, eight hundred twenty".