64431838 has 4 divisors (see below), whose sum is σ = 96647760. Its totient is φ = 32215918.

The previous prime is 64431833. The next prime is 64431883. The reversal of 64431838 is 83813446.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 64431797 and 64431806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64431833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16107958 + ... + 16107961.

It is an arithmetic number, because the mean of its divisors is an integer number (24161940).

Almost surely, 2^64431838 is an apocalyptic number.

64431838 is a deficient number, since it is larger than the sum of its proper divisors (32215922).

64431838 is a wasteful number, since it uses less digits than its factorization.

64431838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32215921.

The product of its digits is 55296, while the sum is 37.

The square root of 64431838 is about 8026.9444996213. The cubic root of 64431838 is about 400.8976465697.

It can be divided in two parts, 6443 and 1838, that added together give a square (8281 = 91²).

The spelling of 64431838 in words is "sixty-four million, four hundred thirty-one thousand, eight hundred thirty-eight".