1781378240048 has 80 divisors (see below), whose sum is σ = 3837178622112. Its totient is φ = 794306304000.

The previous prime is 1781378239973. The next prime is 1781378240051. The reversal of 1781378240048 is 8400428731871.

It is a super-2 number, since 2×1781378240048² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3782108 + ... + 4226948.

Almost surely, 2^{1781378240048} 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 1781378240048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1918589311056).

1781378240048 is an abundant number, since it is smaller than the sum of its proper divisors (2055800382064).

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

1781378240048 is a wasteful number, since it uses less digits than its factorization.

1781378240048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445294 (or 445288 counting only the distinct ones).

The product of its (nonzero) digits is 2408448, while the sum is 53.

The spelling of 1781378240048 in words is "one trillion, seven hundred eighty-one billion, three hundred seventy-eight million, two hundred forty thousand, forty-eight".