645238867 has 32 divisors (see below), whose sum is σ = 826671104. Its totient is φ = 489888000.

The previous prime is 645238837. The next prime is 645238871. The reversal of 645238867 is 768832546.

It is not a de Polignac number, because 645238867 - 2⁷ = 645238739 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 645238867.

It is not an unprimeable number, because it can be changed into a prime (645238807) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 357367 + ... + 359167.

It is an arithmetic number, because the mean of its divisors is an integer number (25833472).

Almost surely, 2^645238867 is an apocalyptic number.

645238867 is a deficient number, since it is larger than the sum of its proper divisors (181432237).

645238867 is a wasteful number, since it uses less digits than its factorization.

645238867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1979.

The product of its digits is 1935360, while the sum is 49.

The square root of 645238867 is about 25401.5524525569. The cubic root of 645238867 is about 864.1189050138.

The spelling of 645238867 in words is "six hundred forty-five million, two hundred thirty-eight thousand, eight hundred sixty-seven".