1778019012 has 480 divisors, whose sum is σ = 6348840960. Its totient is φ = 423403200.

The previous prime is 1778018947. The next prime is 1778019013. The reversal of 1778019012 is 2109108771.

It is a super-2 number, since 2×1778019012² = 6322703214066912288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1778019013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 57355437 + ... + 57355467.

It is an arithmetic number, because the mean of its divisors is an integer number (13226752).

Almost surely, 2^1778019012 is an apocalyptic number.

1778019012 is a gapful number since it is divisible by the number (12) 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 1778019012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3174420480).

1778019012 is an abundant number, since it is smaller than the sum of its proper divisors (4570821948).

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

1778019012 is a wasteful number, since it uses less digits than its factorization.

1778019012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106 (or 73 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 36.

The square root of 1778019012 is about 42166.5627245096. The cubic root of 1778019012 is about 1211.4685200357.

The spelling of 1778019012 in words is "one billion, seven hundred seventy-eight million, nineteen thousand, twelve".