645739260 has 48 divisors (see below), whose sum is σ = 1886685696. Its totient is φ = 164709952.

The previous prime is 645739231. The next prime is 645739261. The reversal of 645739260 is 62937546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645739261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 232584 + ... + 235343.

It is an arithmetic number, because the mean of its divisors is an integer number (39305952).

Almost surely, 2^645739260 is an apocalyptic number.

645739260 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

645739260 is an abundant number, since it is smaller than the sum of its proper divisors (1240946436).

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

645739260 is a wasteful number, since it uses less digits than its factorization.

645739260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467962 (or 467960 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 42.

The square root of 645739260 is about 25411.4001975491. The cubic root of 645739260 is about 864.3422266104.

The spelling of 645739260 in words is "six hundred forty-five million, seven hundred thirty-nine thousand, two hundred sixty".