1778089806 has 192 divisors, whose sum is σ = 4566481920. Its totient is φ = 515082240.

The previous prime is 1778089801. The next prime is 1778089837. The reversal of 1778089806 is 6089808771.

It is a super-2 number, since 2×1778089806² = 6323206716402235272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1778089801) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7377846 + ... + 7378086.

It is an arithmetic number, because the mean of its divisors is an integer number (23783760).

Almost surely, 2^1778089806 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1778089806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2283240960).

1778089806 is an abundant number, since it is smaller than the sum of its proper divisors (2788392114).

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

1778089806 is a wasteful number, since it uses less digits than its factorization.

1778089806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341 (or 329 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 54.

The square root of 1778089806 is about 42167.4021727685. The cubic root of 1778089806 is about 1211.4845985222.

The spelling of 1778089806 in words is "one billion, seven hundred seventy-eight million, eighty-nine thousand, eight hundred six".