645552246 has 64 divisors (see below), whose sum is σ = 1441105920. Its totient is φ = 191911680.

The previous prime is 645552233. The next prime is 645552251. The reversal of 645552246 is 642255546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 128290 + ... + 133226.

It is an arithmetic number, because the mean of its divisors is an integer number (22517280).

Almost surely, 2^645552246 is an apocalyptic number.

645552246 is an abundant number, since it is smaller than the sum of its proper divisors (795553674).

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

645552246 is a wasteful number, since it uses less digits than its factorization.

645552246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5029.

The product of its digits is 288000, while the sum is 39.

The square root of 645552246 is about 25407.7202046937. The cubic root of 645552246 is about 864.2587771882.

The spelling of 645552246 in words is "six hundred forty-five million, five hundred fifty-two thousand, two hundred forty-six".