645453706 has 8 divisors (see below), whose sum is σ = 968460804. Its totient is φ = 322633440.

The previous prime is 645453703. The next prime is 645453707. The reversal of 645453706 is 607354546.

It can be written as a sum of positive squares in 2 ways, for example, as 560979225 + 84474481 = 23685^2 + 9191^2 .

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

It is a super-2 number, since 2×645453706² = 833220973178268872, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645453703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37725 + ... + 52096.

Almost surely, 2^645453706 is an apocalyptic number.

645453706 is a deficient number, since it is larger than the sum of its proper divisors (323007098).

645453706 is a wasteful number, since it uses less digits than its factorization.

645453706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93416.

The product of its (nonzero) digits is 302400, while the sum is 40.

The square root of 645453706 is about 25405.7809563099. The cubic root of 645453706 is about 864.2148001675.

The spelling of 645453706 in words is "six hundred forty-five million, four hundred fifty-three thousand, seven hundred six".