64398838 has 12 divisors (see below), whose sum is σ = 112369572. Its totient is φ = 27599460.

The previous prime is 64398797. The next prime is 64398853. The reversal of 64398838 is 83889346.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a junction number, because it is equal to n+sod(n) for n = 64398791 and 64398800.

It is a congruent number.

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 328468 + ... + 328663.

It is an arithmetic number, because the mean of its divisors is an integer number (9364131).

Almost surely, 2^64398838 is an apocalyptic number.

64398838 is a deficient number, since it is larger than the sum of its proper divisors (47970734).

64398838 is a wasteful number, since it uses less digits than its factorization.

64398838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657147 (or 657140 counting only the distinct ones).

The product of its digits is 995328, while the sum is 49.

The square root of 64398838 is about 8024.8886596638. Note that the first 3 decimals coincide. The cubic root of 64398838 is about 400.8291924121.

The spelling of 64398838 in words is "sixty-four million, three hundred ninety-eight thousand, eight hundred thirty-eight".