644083028742000 has 80 divisors (see below), whose sum is σ = 2076523684683552. Its totient is φ = 171755474329600.

The previous prime is 644083028741927. The next prime is 644083028742073. The reversal of 644083028742000 is 247820380446.

It is an interprime number because it is at equal distance from previous prime (644083028741927) and next prime (644083028742073).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53673579729 + ... + 53673591728.

Almost surely, 2^{644083028742000} is an apocalyptic number.

644083028742000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

644083028742000 is an abundant number, since it is smaller than the sum of its proper divisors (1432440655941552).

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

644083028742000 is a wasteful number, since it uses less digits than its factorization.

644083028742000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107347171483 (or 107347171467 counting only the distinct ones).

The product of its (nonzero) digits is 2064384, while the sum is 48.

The spelling of 644083028742000 in words is "six hundred forty-four trillion, eighty-three billion, twenty-eight million, seven hundred forty-two thousand".