66707478 has 24 divisors (see below), whose sum is σ = 146692728. Its totient is φ = 21903552.

The previous prime is 66707477. The next prime is 66707483. The reversal of 66707478 is 87470766.

It is a super-2 number, since 2×66707478² = 8899775242240968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66707477) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26451 + ... + 28862.

It is an arithmetic number, because the mean of its divisors is an integer number (6112197).

Almost surely, 2^66707478 is an apocalyptic number.

66707478 is an abundant number, since it is smaller than the sum of its proper divisors (79985250).

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

66707478 is a wasteful number, since it uses less digits than its factorization.

66707478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55388 (or 55385 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 45.

The square root of 66707478 is about 8167.4646004742. The cubic root of 66707478 is about 405.5628570845.

The spelling of 66707478 in words is "sixty-six million, seven hundred seven thousand, four hundred seventy-eight".