645781082 has 8 divisors (see below), whose sum is σ = 1019654400. Its totient is φ = 305896284.

The previous prime is 645781043. The next prime is 645781093. The reversal of 645781082 is 280187546.

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

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, 8497082 + ... + 8497157.

It is an arithmetic number, because the mean of its divisors is an integer number (127456800).

Almost surely, 2^645781082 is an apocalyptic number.

645781082 is a deficient number, since it is larger than the sum of its proper divisors (373873318).

645781082 is a wasteful number, since it uses less digits than its factorization.

645781082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16994260.

The product of its (nonzero) digits is 107520, while the sum is 41.

The square root of 645781082 is about 25412.2230826034. The cubic root of 645781082 is about 864.3608862266.

The spelling of 645781082 in words is "six hundred forty-five million, seven hundred eighty-one thousand, eighty-two".