400781896601880 has 256 divisors, whose sum is σ = 1243935030988800. Its totient is φ = 103194132572160.

The previous prime is 400781896601833. The next prime is 400781896601951. The reversal of 400781896601880 is 88106698187004.

It is a super-2 number, since 2×400781896601880² (a number of 30 digits) contains 22 as substring.

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 63 ways as a sum of consecutive naturals, for example, 3691848562 + ... + 3691957118.

It is an arithmetic number, because the mean of its divisors is an integer number (4859121214800).

Almost surely, 2^{400781896601880} is an apocalyptic number.

400781896601880 is a gapful number since it is divisible by the number (40) 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 400781896601880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (621967515494400).

400781896601880 is an abundant number, since it is smaller than the sum of its proper divisors (843153134386920).

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

400781896601880 is a wasteful number, since it uses less digits than its factorization.

400781896601880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110834 (or 110830 counting only the distinct ones).

The product of its (nonzero) digits is 37158912, while the sum is 66.

The spelling of 400781896601880 in words is "four hundred trillion, seven hundred eighty-one billion, eight hundred ninety-six million, six hundred one thousand, eight hundred eighty".