645348398 has 16 divisors (see below), whose sum is σ = 1010651040. Its totient is φ = 308479776.

The previous prime is 645348377. The next prime is 645348419. The reversal of 645348398 is 893843546.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (645348377) and next prime (645348419).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159788 + ... + 163776.

It is an arithmetic number, because the mean of its divisors is an integer number (63165690).

Almost surely, 2^645348398 is an apocalyptic number.

645348398 is a deficient number, since it is larger than the sum of its proper divisors (365302642).

645348398 is a wasteful number, since it uses less digits than its factorization.

645348398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7531.

The product of its digits is 2488320, while the sum is 50.

The square root of 645348398 is about 25403.7083513411. The cubic root of 645348398 is about 864.1677977353.

The spelling of 645348398 in words is "six hundred forty-five million, three hundred forty-eight thousand, three hundred ninety-eight".