64238181 has 16 divisors (see below), whose sum is σ = 98304000. Its totient is φ = 36551088.

The previous prime is 64238177. The next prime is 64238201. The reversal of 64238181 is 18183246.

64238181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 64238181 - 2² = 64238177 is a prime.

It is a super-2 number, since 2×64238181² = 8253087796377522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64238131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1381 + ... + 11418.

It is an arithmetic number, because the mean of its divisors is an integer number (6144000).

Almost surely, 2^64238181 is an apocalyptic number.

It is an amenable number.

64238181 is a deficient number, since it is larger than the sum of its proper divisors (34065819).

64238181 is a wasteful number, since it uses less digits than its factorization.

64238181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13048.

The product of its digits is 9216, while the sum is 33.

The square root of 64238181 is about 8014.8724880687. The cubic root of 64238181 is about 400.4955961243.

The spelling of 64238181 in words is "sixty-four million, two hundred thirty-eight thousand, one hundred eighty-one".