645262848 has 100 divisors (see below), whose sum is σ = 1926063480. Its totient is φ = 215073792.

The previous prime is 645262843. The next prime is 645262853. The reversal of 645262848 is 848262546.

645262848 is a `hidden beast` number, since 64 + 526 + 28 + 48 = 666.

It is an interprime number because it is at equal distance from previous prime (645262843) and next prime (645262853).

It is a super-2 number, since 2×645262848² = 832728286018142208, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645262843) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 33693 + ... + 49251.

Almost surely, 2^645262848 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645262848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (963031740).

645262848 is an abundant number, since it is smaller than the sum of its proper divisors (1280800632).

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

645262848 is an equidigital number, since it uses as much as digits as its factorization.

645262848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15589 (or 15564 counting only the distinct ones).

The product of its digits is 737280, while the sum is 45.

The square root of 645262848 is about 25402.0244862491. The cubic root of 645262848 is about 864.1296101856.

The spelling of 645262848 in words is "six hundred forty-five million, two hundred sixty-two thousand, eight hundred forty-eight".