1778344540 has 48 divisors (see below), whose sum is σ = 4286423232. Its totient is φ = 607090176.

The previous prime is 1778344531. The next prime is 1778344541. The reversal of 1778344540 is 454438771.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1778344541) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 5362 + ... + 59878.

It is an arithmetic number, because the mean of its divisors is an integer number (89300484).

Almost surely, 2^1778344540 is an apocalyptic number.

1778344540 is a gapful number since it is divisible by the number (10) 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 1778344540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2143211616).

1778344540 is an abundant number, since it is smaller than the sum of its proper divisors (2508078692).

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

1778344540 is a wasteful number, since it uses less digits than its factorization.

1778344540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54766 (or 54764 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 43.

The square root of 1778344540 is about 42170.4225731733. The cubic root of 1778344540 is about 1211.5424492900.

The spelling of 1778344540 in words is "one billion, seven hundred seventy-eight million, three hundred forty-four thousand, five hundred forty".