645506434 has 8 divisors (see below), whose sum is σ = 968417280. Its totient is φ = 322700676.

The previous prime is 645506401. The next prime is 645506461. The reversal of 645506434 is 434605546.

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

It is a junction number, because it is equal to n+sod(n) for n = 645506393 and 645506402.

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, 8514 + ... + 36925.

It is an arithmetic number, because the mean of its divisors is an integer number (121052160).

Almost surely, 2^645506434 is an apocalyptic number.

645506434 is a deficient number, since it is larger than the sum of its proper divisors (322910846).

645506434 is a wasteful number, since it uses less digits than its factorization.

645506434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52544.

The product of its (nonzero) digits is 172800, while the sum is 37.

The square root of 645506434 is about 25406.8186516927. The cubic root of 645506434 is about 864.2383324915.

The spelling of 645506434 in words is "six hundred forty-five million, five hundred six thousand, four hundred thirty-four".