645605510 has 32 divisors (see below), whose sum is σ = 1275547392. Its totient is φ = 233318880.

The previous prime is 645605507. The next prime is 645605537. The reversal of 645605510 is 15506546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74 + ... + 35933.

It is an arithmetic number, because the mean of its divisors is an integer number (39860856).

Almost surely, 2^645605510 is an apocalyptic number.

645605510 is a deficient number, since it is larger than the sum of its proper divisors (629941882).

645605510 is a wasteful number, since it uses less digits than its factorization.

645605510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36188.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 645605510 is about 25408.7683684196. The cubic root of 645605510 is about 864.2825463016.

The spelling of 645605510 in words is "six hundred forty-five million, six hundred five thousand, five hundred ten".