645426146 has 8 divisors (see below), whose sum is σ = 1001523420. Its totient is φ = 311585008.

The previous prime is 645426091. The next prime is 645426203. The reversal of 645426146 is 641624546.

It can be written as a sum of positive squares in 2 ways, for example, as 573363025 + 72063121 = 23945^2 + 8489^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5563961 + ... + 5564076.

Almost surely, 2^645426146 is an apocalyptic number.

645426146 is a deficient number, since it is larger than the sum of its proper divisors (356097274).

645426146 is a wasteful number, since it uses less digits than its factorization.

645426146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11128068.

The product of its digits is 138240, while the sum is 38.

The square root of 645426146 is about 25405.2385542825. The cubic root of 645426146 is about 864.2024997248.

The spelling of 645426146 in words is "six hundred forty-five million, four hundred twenty-six thousand, one hundred forty-six".