645296278 has 32 divisors (see below), whose sum is σ = 1113552000. Its totient is φ = 277369920.

The previous prime is 645296273. The next prime is 645296287. The reversal of 645296278 is 872692546.

645296278 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645296273) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 307858 + ... + 309946.

It is an arithmetic number, because the mean of its divisors is an integer number (34798500).

Almost surely, 2^645296278 is an apocalyptic number.

645296278 is a deficient number, since it is larger than the sum of its proper divisors (468255722).

645296278 is a wasteful number, since it uses less digits than its factorization.

645296278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2860.

The product of its digits is 1451520, while the sum is 49.

The square root of 645296278 is about 25402.6824961460. The cubic root of 645296278 is about 864.1445329694.

It can be divided in two parts, 64529 and 6278, that added together give a palindrome (70807).

The spelling of 645296278 in words is "six hundred forty-five million, two hundred ninety-six thousand, two hundred seventy-eight".