645523498 has 8 divisors (see below), whose sum is σ = 970882308. Its totient is φ = 321896064.

The previous prime is 645523481. The next prime is 645523513. The reversal of 645523498 is 894325546.

645523498 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 614197089 + 31326409 = 24783^2 + 5597^2 .

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

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, 431911 + ... + 433402.

Almost surely, 2^645523498 is an apocalyptic number.

645523498 is a deficient number, since it is larger than the sum of its proper divisors (325358810).

645523498 is a wasteful number, since it uses less digits than its factorization.

645523498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865688.

The product of its digits is 1036800, while the sum is 46.

The square root of 645523498 is about 25407.1544648353. The cubic root of 645523498 is about 864.2459478212.

The spelling of 645523498 in words is "six hundred forty-five million, five hundred twenty-three thousand, four hundred ninety-eight".