64131438 has 32 divisors (see below), whose sum is σ = 146824704. Its totient is φ = 18293472.

The previous prime is 64131433. The next prime is 64131451. The reversal of 64131438 is 83413146.

It is a super-2 number, since 2×64131438² = 8225682679895688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64131433) 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, 46231 + ... + 47597.

It is an arithmetic number, because the mean of its divisors is an integer number (4588272).

Almost surely, 2^64131438 is an apocalyptic number.

64131438 is an abundant number, since it is smaller than the sum of its proper divisors (82693266).

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

64131438 is a wasteful number, since it uses less digits than its factorization.

64131438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2496.

The product of its digits is 6912, while the sum is 30.

The square root of 64131438 is about 8008.2106615648. The cubic root of 64131438 is about 400.2736419242.

The spelling of 64131438 in words is "sixty-four million, one hundred thirty-one thousand, four hundred thirty-eight".