640662230 has 32 divisors (see below), whose sum is σ = 1243396224. Its totient is φ = 236267136.

The previous prime is 640662227. The next prime is 640662233. The reversal of 640662230 is 32266046.

It is an interprime number because it is at equal distance from previous prime (640662227) and next prime (640662233).

It is a junction number, because it is equal to n+sod(n) for n = 640662193 and 640662202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640662233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127139 + ... + 132081.

It is an arithmetic number, because the mean of its divisors is an integer number (38856132).

Almost surely, 2^640662230 is an apocalyptic number.

640662230 is a deficient number, since it is larger than the sum of its proper divisors (602733994).

640662230 is a wasteful number, since it uses less digits than its factorization.

640662230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5960.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 640662230 is about 25311.3063669183. The cubic root of 640662230 is about 862.0710092360.

The spelling of 640662230 in words is "six hundred forty million, six hundred sixty-two thousand, two hundred thirty".