645269806 has 8 divisors (see below), whose sum is σ = 986167224. Its totient is φ = 316547400.

The previous prime is 645269803. The next prime is 645269851. The reversal of 645269806 is 608962546.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645269803) 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, 3043620 + ... + 3043831.

It is an arithmetic number, because the mean of its divisors is an integer number (123270903).

Almost surely, 2^645269806 is an apocalyptic number.

645269806 is a deficient number, since it is larger than the sum of its proper divisors (340897418).

645269806 is a wasteful number, since it uses less digits than its factorization.

645269806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6087506.

The product of its (nonzero) digits is 622080, while the sum is 46.

The square root of 645269806 is about 25402.1614434678. The cubic root of 645269806 is about 864.1327162026.

The spelling of 645269806 in words is "six hundred forty-five million, two hundred sixty-nine thousand, eight hundred six".