640852451 has 8 divisors (see below), whose sum is σ = 679777920. Its totient is φ = 602063488.

The previous prime is 640852423. The next prime is 640852453. The reversal of 640852451 is 154258046.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640852451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640852453) 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, 24371 + ... + 43308.

It is an arithmetic number, because the mean of its divisors is an integer number (84972240).

Almost surely, 2^640852451 is an apocalyptic number.

640852451 is a deficient number, since it is larger than the sum of its proper divisors (38925469).

640852451 is a wasteful number, since it uses less digits than its factorization.

640852451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68253.

The product of its (nonzero) digits is 38400, while the sum is 35.

The square root of 640852451 is about 25315.0637170835. The cubic root of 640852451 is about 862.1563208478.

The spelling of 640852451 in words is "six hundred forty million, eight hundred fifty-two thousand, four hundred fifty-one".