645682427 has 8 divisors (see below), whose sum is σ = 725583264. Its totient is φ = 570100608.

The previous prime is 645682421. The next prime is 645682469. The reversal of 645682427 is 724286546.

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 645682427 - 2²² = 641488123 is a prime.

It is a super-2 number, since 2×645682427² = 833811593073220658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645682421) 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, 1079438 + ... + 1080035.

It is an arithmetic number, because the mean of its divisors is an integer number (90697908).

Almost surely, 2^645682427 is an apocalyptic number.

645682427 is a deficient number, since it is larger than the sum of its proper divisors (79900837).

645682427 is a wasteful number, since it uses less digits than its factorization.

645682427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2159509.

The product of its digits is 645120, while the sum is 44.

The square root of 645682427 is about 25410.2819150044. The cubic root of 645682427 is about 864.3168682829.

The spelling of 645682427 in words is "six hundred forty-five million, six hundred eighty-two thousand, four hundred twenty-seven".