640230552 has 48 divisors (see below), whose sum is σ = 1867341840. Its totient is φ = 196993728.

The previous prime is 640230533. The next prime is 640230559. The reversal of 640230552 is 255032046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640230559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 341068 + ... + 342939.

It is an arithmetic number, because the mean of its divisors is an integer number (38902955).

Almost surely, 2^640230552 is an apocalyptic number.

It is an amenable number.

640230552 is an abundant number, since it is smaller than the sum of its proper divisors (1227111288).

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

640230552 is a wasteful number, since it uses less digits than its factorization.

640230552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684032 (or 684025 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 640230552 is about 25302.7775550432. Note that the first 3 decimals coincide. The cubic root of 640230552 is about 861.8773446782.

Adding to 640230552 its reverse (255032046), we get a palindrome (895262598).

The spelling of 640230552 in words is "six hundred forty million, two hundred thirty thousand, five hundred fifty-two".