66400430 has 32 divisors (see below), whose sum is σ = 124921440. Its totient is φ = 25379200.

The previous prime is 66400427. The next prime is 66400441. The reversal of 66400430 is 3400466.

It is a junction number, because it is equal to n+sod(n) for n = 66400396 and 66400405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28157 + ... + 30423.

It is an arithmetic number, because the mean of its divisors is an integer number (3903795).

Almost surely, 2^66400430 is an apocalyptic number.

66400430 is a deficient number, since it is larger than the sum of its proper divisors (58521010).

66400430 is a wasteful number, since it uses less digits than its factorization.

66400430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2404.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 66400430 is about 8148.6458997799. The cubic root of 66400430 is about 404.9396445140.

Adding to 66400430 its reverse (3400466), we get a palindrome (69800896).

The spelling of 66400430 in words is "sixty-six million, four hundred thousand, four hundred thirty".