66678430 has 64 divisors (see below), whose sum is σ = 150958080. Its totient is φ = 20640384.

The previous prime is 66678421. The next prime is 66678431. The reversal of 66678430 is 3487666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66678431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41991 + ... + 43549.

It is an arithmetic number, because the mean of its divisors is an integer number (2358720).

Almost surely, 2^66678430 is an apocalyptic number.

66678430 is an abundant number, since it is smaller than the sum of its proper divisors (84279650).

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

66678430 is a wasteful number, since it uses less digits than its factorization.

66678430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633.

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 66678430 is about 8165.6861316120. The cubic root of 66678430 is about 405.5039806255.

The spelling of 66678430 in words is "sixty-six million, six hundred seventy-eight thousand, four hundred thirty".