671927650128 has 400 divisors, whose sum is σ = 2301814293504. Its totient is φ = 185175797760.

The previous prime is 671927650057. The next prime is 671927650133. The reversal of 671927650128 is 821056729176.

671927650128 is a `hidden beast` number, since 67 + 1 + 9 + 2 + 76 + 501 + 2 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 89146776 + ... + 89154312.

Almost surely, 2^671927650128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671927650128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1150907146752).

671927650128 is an abundant number, since it is smaller than the sum of its proper divisors (1629886643376).

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

671927650128 is a wasteful number, since it uses less digits than its factorization.

671927650128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7912 (or 7897 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 54.

The spelling of 671927650128 in words is "six hundred seventy-one billion, nine hundred twenty-seven million, six hundred fifty thousand, one hundred twenty-eight".