640146830 has 8 divisors (see below), whose sum is σ = 1152264312. Its totient is φ = 256058728.

The previous prime is 640146823. The next prime is 640146853. The reversal of 640146830 is 38641046.

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

It is a congruent number.

It is an unprimeable number.

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, 32007332 + ... + 32007351.

It is an arithmetic number, because the mean of its divisors is an integer number (144033039).

Almost surely, 2^640146830 is an apocalyptic number.

640146830 is a deficient number, since it is larger than the sum of its proper divisors (512117482).

640146830 is a wasteful number, since it uses less digits than its factorization.

640146830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64014690.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 640146830 is about 25301.1230976018. The cubic root of 640146830 is about 861.8397742330.

Adding to 640146830 its reverse (38641046), we get a palindrome (678787876).

The spelling of 640146830 in words is "six hundred forty million, one hundred forty-six thousand, eight hundred thirty".