640512452 has 12 divisors (see below), whose sum is σ = 1157054976. Its totient is φ = 309925320.

The previous prime is 640512443. The next prime is 640512461. The reversal of 640512452 is 254215046.

It is an interprime number because it is at equal distance from previous prime (640512443) and next prime (640512461).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2582588 + ... + 2582835.

It is an arithmetic number, because the mean of its divisors is an integer number (96421248).

Almost surely, 2^640512452 is an apocalyptic number.

640512452 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

640512452 is a deficient number, since it is larger than the sum of its proper divisors (516542524).

640512452 is a wasteful number, since it uses less digits than its factorization.

640512452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5165458 (or 5165456 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 640512452 is about 25308.3474766726. The cubic root of 640512452 is about 862.0038238930.

Adding to 640512452 its reverse (254215046), we get a palindrome (894727498).

The spelling of 640512452 in words is "six hundred forty million, five hundred twelve thousand, four hundred fifty-two".