671130720400 has 240 divisors, whose sum is σ = 1855231257600. Its totient is φ = 228546478080.

The previous prime is 671130720391. The next prime is 671130720409. The reversal of 671130720400 is 4027031176.

It is an interprime number because it is at equal distance from previous prime (671130720391) and next prime (671130720409).

It is not an unprimeable number, because it can be changed into a prime (671130720409) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 355282656 + ... + 355284544.

It is an arithmetic number, because the mean of its divisors is an integer number (7730130240).

Almost surely, 2^671130720400 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 671130720400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (927615628800).

671130720400 is an abundant number, since it is smaller than the sum of its proper divisors (1184100537200).

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

671130720400 is a wasteful number, since it uses less digits than its factorization.

671130720400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2706 (or 2695 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 31.

Adding to 671130720400 its reverse (4027031176), we get a palindrome (675157751576).

The spelling of 671130720400 in words is "six hundred seventy-one billion, one hundred thirty million, seven hundred twenty thousand, four hundred".