64136220 has 48 divisors (see below), whose sum is σ = 183765120. Its totient is φ = 16704576.

The previous prime is 64136209. The next prime is 64136221. The reversal of 64136220 is 2263146.

It is a super-2 number, since 2×64136220² = 8226909431776800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64136221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9850 + ... + 15009.

It is an arithmetic number, because the mean of its divisors is an integer number (3828440).

Almost surely, 2^64136220 is an apocalyptic number.

64136220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64136220 is an abundant number, since it is smaller than the sum of its proper divisors (119628900).

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

64136220 is a wasteful number, since it uses less digits than its factorization.

64136220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24914 (or 24912 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 64136220 is about 8008.5092245686. The cubic root of 64136220 is about 400.2835905601.

Adding to 64136220 its reverse (2263146), we get a palindrome (66399366).

The spelling of 64136220 in words is "sixty-four million, one hundred thirty-six thousand, two hundred twenty".