671128370640 has 800 divisors, whose sum is σ = 2927508460800. Its totient is φ = 141594614784.

The previous prime is 671128370617. The next prime is 671128370659. The reversal of 671128370640 is 46073821176.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 28882707 + ... + 28905933.

It is an arithmetic number, because the mean of its divisors is an integer number (3659385576).

Almost surely, 2^671128370640 is an apocalyptic number.

671128370640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671128370640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1463754230400).

671128370640 is an abundant number, since it is smaller than the sum of its proper divisors (2256380090160).

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

671128370640 is a wasteful number, since it uses less digits than its factorization.

671128370640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23286 (or 23257 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The spelling of 671128370640 in words is "six hundred seventy-one billion, one hundred twenty-eight million, three hundred seventy thousand, six hundred forty".