645311950 has 24 divisors (see below), whose sum is σ = 1205324640. Its totient is φ = 257040000.

The previous prime is 645311929. The next prime is 645311981. The reversal of 645311950 is 59113546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15051 + ... + 38950.

It is an arithmetic number, because the mean of its divisors is an integer number (50221860).

Almost surely, 2^645311950 is an apocalyptic number.

645311950 is a deficient number, since it is larger than the sum of its proper divisors (560012690).

645311950 is a wasteful number, since it uses less digits than its factorization.

645311950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54252 (or 54247 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 645311950 is about 25402.9909656324. The cubic root of 645311950 is about 864.1515286002.

The spelling of 645311950 in words is "six hundred forty-five million, three hundred eleven thousand, nine hundred fifty".