645267810 has 64 divisors (see below), whose sum is σ = 1788822144. Its totient is φ = 147225600.

The previous prime is 645267757. The next prime is 645267811. The reversal of 645267810 is 18762546.

It is a super-2 number, since 2×645267810² = 832741093244392200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645267811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51901 + ... + 63120.

It is an arithmetic number, because the mean of its divisors is an integer number (27950346).

Almost surely, 2^645267810 is an apocalyptic number.

645267810 is an abundant number, since it is smaller than the sum of its proper divisors (1143554334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645267810 is a wasteful number, since it uses less digits than its factorization.

645267810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115059.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 645267810 is about 25402.1221554421. The cubic root of 645267810 is about 864.1318252003.

The spelling of 645267810 in words is "six hundred forty-five million, two hundred sixty-seven thousand, eight hundred ten".