1778020416 has 112 divisors (see below), whose sum is σ = 5348833600. Its totient is φ = 578866176.

The previous prime is 1778020381. The next prime is 1778020457. The reversal of 1778020416 is 6140208771.

It is a super-2 number, since 2×1778020416² = 6322713199425626112, which contains 22 as substring.

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

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, 62340 + ... + 86268.

Almost surely, 2^1778020416 is an apocalyptic number.

1778020416 is a gapful number since it is divisible by the number (16) 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 1778020416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2674416800).

1778020416 is an abundant number, since it is smaller than the sum of its proper divisors (3570813184).

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

1778020416 is a wasteful number, since it uses less digits than its factorization.

1778020416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23993 (or 23977 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 1778020416 is about 42166.5793727687. The cubic root of 1778020416 is about 1211.4688389114.

The spelling of 1778020416 in words is "one billion, seven hundred seventy-eight million, twenty thousand, four hundred sixteen".