66678938 has 8 divisors (see below), whose sum is σ = 100172160. Its totient is φ = 33288220.

The previous prime is 66678901. The next prime is 66678949. The reversal of 66678938 is 83987666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 66678938.

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, 23978 + ... + 26613.

It is an arithmetic number, because the mean of its divisors is an integer number (12521520).

Almost surely, 2^66678938 is an apocalyptic number.

66678938 is a deficient number, since it is larger than the sum of its proper divisors (33493222).

66678938 is a wasteful number, since it uses less digits than its factorization.

66678938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51252.

The product of its digits is 2612736, while the sum is 53.

The square root of 66678938 is about 8165.7172373283. The cubic root of 66678938 is about 405.5050104213.

It can be divided in two parts, 6 and 6678938, that multiplied together give a triangular number (40073628 = T₈₉₅₂).

The spelling of 66678938 in words is "sixty-six million, six hundred seventy-eight thousand, nine hundred thirty-eight".