1069643778 has 64 divisors (see below), whose sum is σ = 2529361920. Its totient is φ = 295099200.

The previous prime is 1069643777. The next prime is 1069643837. The reversal of 1069643778 is 8773469601.

It is a super-2 number, since 2×1069643778² = 2288275623628226568, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1069643778.

It is not an unprimeable number, because it can be changed into a prime (1069643777) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1078863 + ... + 1079853.

It is an arithmetic number, because the mean of its divisors is an integer number (39521280).

Almost surely, 2^1069643778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1069643778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1264680960).

1069643778 is an abundant number, since it is smaller than the sum of its proper divisors (1459718142).

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

1069643778 is a wasteful number, since it uses less digits than its factorization.

1069643778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1863.

The product of its (nonzero) digits is 1524096, while the sum is 51.

The square root of 1069643778 is about 32705.4090021819. The cubic root of 1069643778 is about 1022.6956053986.

The spelling of 1069643778 in words is "one billion, sixty-nine million, six hundred forty-three thousand, seven hundred seventy-eight".