645079895 has 8 divisors (see below), whose sum is σ = 775637856. Its totient is φ = 515035936.

The previous prime is 645079891. The next prime is 645079969. The reversal of 645079895 is 598970546.

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

It is a cyclic number.

It is not a de Polignac number, because 645079895 - 2² = 645079891 is a prime.

It is a super-2 number, since 2×645079895² = 832256141866422050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645079891) 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, 125732 + ... + 130761.

It is an arithmetic number, because the mean of its divisors is an integer number (96954732).

Almost surely, 2^645079895 is an apocalyptic number.

645079895 is a deficient number, since it is larger than the sum of its proper divisors (130557961).

645079895 is a wasteful number, since it uses less digits than its factorization.

645079895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257001.

The product of its (nonzero) digits is 2721600, while the sum is 53.

The square root of 645079895 is about 25398.4230809710. The cubic root of 645079895 is about 864.0479328510.

The spelling of 645079895 in words is "six hundred forty-five million, seventy-nine thousand, eight hundred ninety-five".