1778082840 has 80 divisors (see below), whose sum is σ = 5976344880. Its totient is φ = 474154560.

The previous prime is 1778082821. The next prime is 1778082877. The reversal of 1778082840 is 482808771.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 271156 + ... + 277635.

It is an arithmetic number, because the mean of its divisors is an integer number (74704311).

Almost surely, 2^1778082840 is an apocalyptic number.

1778082840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1778082840 is an abundant number, since it is smaller than the sum of its proper divisors (4198262040).

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

1778082840 is a wasteful number, since it uses less digits than its factorization.

1778082840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548814 (or 548801 counting only the distinct ones).

The product of its (nonzero) digits is 200704, while the sum is 45.

The square root of 1778082840 is about 42167.3195733378. The cubic root of 1778082840 is about 1211.4830164475.

The spelling of 1778082840 in words is "one billion, seven hundred seventy-eight million, eighty-two thousand, eight hundred forty".