645290493 has 8 divisors (see below), whose sum is σ = 874970400. Its totient is φ = 422902128.

The previous prime is 645290491. The next prime is 645290509. The reversal of 645290493 is 394092546.

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

It is not a de Polignac number, because 645290493 - 2¹ = 645290491 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645290491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1822678 + ... + 1823031.

It is an arithmetic number, because the mean of its divisors is an integer number (109371300).

Almost surely, 2^645290493 is an apocalyptic number.

It is an amenable number.

645290493 is a deficient number, since it is larger than the sum of its proper divisors (229679907).

645290493 is a wasteful number, since it uses less digits than its factorization.

645290493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3645771.

The product of its (nonzero) digits is 233280, while the sum is 42.

The square root of 645290493 is about 25402.5686299634. The cubic root of 645290493 is about 864.1419506460.

The spelling of 645290493 in words is "six hundred forty-five million, two hundred ninety thousand, four hundred ninety-three".