645777286 has 16 divisors (see below), whose sum is σ = 1207687680. Its totient is φ = 251601480.

The previous prime is 645777277. The next prime is 645777287. The reversal of 645777286 is 682777546.

It is a super-2 number, since 2×645777286² = 834056606227051592, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645777287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2096526 + ... + 2096833.

It is an arithmetic number, because the mean of its divisors is an integer number (75480480).

Almost surely, 2^645777286 is an apocalyptic number.

645777286 is a deficient number, since it is larger than the sum of its proper divisors (561910394).

645777286 is a wasteful number, since it uses less digits than its factorization.

645777286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4193379.

The product of its digits is 3951360, while the sum is 52.

The square root of 645777286 is about 25412.1483940260. The cubic root of 645777286 is about 864.3591926081.

The spelling of 645777286 in words is "six hundred forty-five million, seven hundred seventy-seven thousand, two hundred eighty-six".