66398438 has 8 divisors (see below), whose sum is σ = 100173888. Its totient is φ = 33007144.

The previous prime is 66398399. The next prime is 66398443. The reversal of 66398438 is 83489366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 66398392 and 66398401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95606 + ... + 96297.

It is an arithmetic number, because the mean of its divisors is an integer number (12521736).

Almost surely, 2^66398438 is an apocalyptic number.

66398438 is a deficient number, since it is larger than the sum of its proper divisors (33775450).

66398438 is a wasteful number, since it uses less digits than its factorization.

66398438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192078.

The product of its digits is 746496, while the sum is 47.

The square root of 66398438 is about 8148.5236699662. The cubic root of 66398438 is about 404.9355951033.

The spelling of 66398438 in words is "sixty-six million, three hundred ninety-eight thousand, four hundred thirty-eight".