66767478 has 8 divisors (see below), whose sum is σ = 133534968. Its totient is φ = 22255824.

The previous prime is 66767473. The next prime is 66767497. The reversal of 66767478 is 87476766.

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

66767478 is an admirable number.

It is a super-2 number, since 2×66767478² = 8915792236960968, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66767478.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66767471) 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 in 3 ways as a sum of consecutive naturals, for example, 5563951 + ... + 5563962.

It is an arithmetic number, because the mean of its divisors is an integer number (16691871).

Almost surely, 2^66767478 is an apocalyptic number.

66767478 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66767478 is a wasteful number, since it uses less digits than its factorization.

66767478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11127918.

The product of its digits is 2370816, while the sum is 51.

The square root of 66767478 is about 8171.1368854034. The cubic root of 66767478 is about 405.6844150673.

The spelling of 66767478 in words is "sixty-six million, seven hundred sixty-seven thousand, four hundred seventy-eight".