783278138880 has 400 divisors, whose sum is σ = 2970494920800. Its totient is φ = 196586569728.

The previous prime is 783278138861. The next prime is 783278138921. The reversal of 783278138880 is 88831872387.

783278138880 is a `hidden beast` number, since 7 + 83 + 27 + 81 + 388 + 80 = 666.

It is a super-2 number, since 2×783278138880² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3414021 + ... + 3636219.

It is an arithmetic number, because the mean of its divisors is an integer number (7426237302).

Almost surely, 2^783278138880 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 783278138880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1485247460400).

783278138880 is an abundant number, since it is smaller than the sum of its proper divisors (2187216781920).

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

783278138880 is a wasteful number, since it uses less digits than its factorization.

783278138880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222251 (or 222226 counting only the distinct ones).

The product of its (nonzero) digits is 28901376, while the sum is 63.

The spelling of 783278138880 in words is "seven hundred eighty-three billion, two hundred seventy-eight million, one hundred thirty-eight thousand, eight hundred eighty".