645143235 has 16 divisors (see below), whose sum is σ = 1126068480. Its totient is φ = 312796640.

The previous prime is 645143231. The next prime is 645143243. The reversal of 645143235 is 532341546.

It is not a de Polignac number, because 645143235 - 2² = 645143231 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 645143196 and 645143205.

It is not an unprimeable number, because it can be changed into a prime (645143231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1954815 + ... + 1955144.

It is an arithmetic number, because the mean of its divisors is an integer number (70379280).

Almost surely, 2^645143235 is an apocalyptic number.

645143235 is a deficient number, since it is larger than the sum of its proper divisors (480925245).

645143235 is a wasteful number, since it uses less digits than its factorization.

645143235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3909978.

The product of its digits is 43200, while the sum is 33.

The square root of 645143235 is about 25399.6699781710. The cubic root of 645143235 is about 864.0762120380.

The spelling of 645143235 in words is "six hundred forty-five million, one hundred forty-three thousand, two hundred thirty-five".