645755734 has 8 divisors (see below), whose sum is σ = 1043143920. Its totient is φ = 298041096.

The previous prime is 645755729. The next prime is 645755741. The reversal of 645755734 is 437557546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12418354 + ... + 12418405.

It is an arithmetic number, because the mean of its divisors is an integer number (130392990).

Almost surely, 2^645755734 is an apocalyptic number.

645755734 is a deficient number, since it is larger than the sum of its proper divisors (397388186).

645755734 is a wasteful number, since it uses less digits than its factorization.

645755734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24836774.

The product of its digits is 1764000, while the sum is 46.

The square root of 645755734 is about 25411.7243413350. The cubic root of 645755734 is about 864.3495768696.

The spelling of 645755734 in words is "six hundred forty-five million, seven hundred fifty-five thousand, seven hundred thirty-four".