640213465 has 8 divisors (see below), whose sum is σ = 769385088. Its totient is φ = 511418160.

The previous prime is 640213463. The next prime is 640213499. The reversal of 640213465 is 564312046.

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

It is not a de Polignac number, because 640213465 - 2¹ = 640213463 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640213463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90321 + ... + 97150.

It is an arithmetic number, because the mean of its divisors is an integer number (96173136).

Almost surely, 2^640213465 is an apocalyptic number.

It is an amenable number.

640213465 is a deficient number, since it is larger than the sum of its proper divisors (129171623).

640213465 is a wasteful number, since it uses less digits than its factorization.

640213465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188159.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 640213465 is about 25302.4399021122. The cubic root of 640213465 is about 861.8696771126.

The spelling of 640213465 in words is "six hundred forty million, two hundred thirteen thousand, four hundred sixty-five".