66838936 has 16 divisors (see below), whose sum is σ = 127688400. Its totient is φ = 32788704.

The previous prime is 66838921. The next prime is 66838963. The reversal of 66838936 is 63983866.

It is a super-2 number, since 2×66838936² = 8934886731224192, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66838936.

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, 78396 + ... + 79243.

It is an arithmetic number, because the mean of its divisors is an integer number (7980525).

Almost surely, 2^66838936 is an apocalyptic number.

It is an amenable number.

66838936 is a deficient number, since it is larger than the sum of its proper divisors (60849464).

66838936 is a wasteful number, since it uses less digits than its factorization.

66838936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157698 (or 157694 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 49.

The square root of 66838936 is about 8175.5083022403. The cubic root of 66838936 is about 405.8290915973.

The spelling of 66838936 in words is "sixty-six million, eight hundred thirty-eight thousand, nine hundred thirty-six".