645270759 has 24 divisors (see below), whose sum is σ = 1112033520. Its totient is φ = 368725392.

The previous prime is 645270739. The next prime is 645270767. The reversal of 645270759 is 957072546.

It is not a de Polignac number, because 645270759 - 2¹² = 645266663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645270739) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 242544 + ... + 245189.

It is an arithmetic number, because the mean of its divisors is an integer number (46334730).

Almost surely, 2^645270759 is an apocalyptic number.

645270759 is a deficient number, since it is larger than the sum of its proper divisors (466762761).

645270759 is a wasteful number, since it uses less digits than its factorization.

645270759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487756 (or 487743 counting only the distinct ones).

The product of its (nonzero) digits is 529200, while the sum is 45.

The square root of 645270759 is about 25402.1802017071. The cubic root of 645270759 is about 864.1331416154.

The spelling of 645270759 in words is "six hundred forty-five million, two hundred seventy thousand, seven hundred fifty-nine".