645093801 has 24 divisors (see below), whose sum is σ = 1054164384. Its totient is φ = 390964320.

The previous prime is 645093797. The next prime is 645093803. The reversal of 645093801 is 108390546.

645093801 is a `hidden beast` number, since 645 + 0 + 9 + 3 + 8 + 0 + 1 = 666.

It is not a de Polignac number, because 645093801 - 2² = 645093797 is a prime.

It is a super-2 number, since 2×645093801² = 832292024177255202, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645093803) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 117996 + ... + 123341.

It is an arithmetic number, because the mean of its divisors is an integer number (43923516).

Almost surely, 2^645093801 is an apocalyptic number.

It is an amenable number.

645093801 is a deficient number, since it is larger than the sum of its proper divisors (409070583).

645093801 is a wasteful number, since it uses less digits than its factorization.

645093801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241363 (or 241351 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 645093801 is about 25398.6968366489. The cubic root of 645093801 is about 864.0541415725.

The spelling of 645093801 in words is "six hundred forty-five million, ninety-three thousand, eight hundred one".