645477063 has 128 divisors (see below), whose sum is σ = 1230888960. Its totient is φ = 290304000.

The previous prime is 645477061. The next prime is 645477121. The reversal of 645477063 is 360774546.

It is a happy number.

It is not a de Polignac number, because 645477063 - 2¹ = 645477061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645477061) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3059028 + ... + 3059238.

It is an arithmetic number, because the mean of its divisors is an integer number (9616320).

Almost surely, 2^645477063 is an apocalyptic number.

645477063 is a deficient number, since it is larger than the sum of its proper divisors (585411897).

645477063 is a wasteful number, since it uses less digits than its factorization.

645477063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309.

The product of its (nonzero) digits is 423360, while the sum is 42.

The square root of 645477063 is about 25406.2406309946. The cubic root of 645477063 is about 864.2252244739.

The spelling of 645477063 in words is "six hundred forty-five million, four hundred seventy-seven thousand, sixty-three".