644890089247 has 8 divisors (see below), whose sum is σ = 660655970352. Its totient is φ = 629125963200.

The previous prime is 644890089241. The next prime is 644890089287. The reversal of 644890089247 is 742980098446.

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

It is a cyclic number.

It is not a de Polignac number, because 644890089247 - 2¹⁹ = 644889564959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644890089241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 320997 + ... + 1180177.

It is an arithmetic number, because the mean of its divisors is an integer number (82581996294).

Almost surely, 2^644890089247 is an apocalyptic number.

644890089247 is a deficient number, since it is larger than the sum of its proper divisors (15765881105).

644890089247 is a wasteful number, since it uses less digits than its factorization.

644890089247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 877529.

The product of its (nonzero) digits is 27869184, while the sum is 61.

The spelling of 644890089247 in words is "six hundred forty-four billion, eight hundred ninety million, eighty-nine thousand, two hundred forty-seven".