2069431778 has 18 divisors (see below), whose sum is σ = 3278058849. Its totient is φ = 979678152.

The previous prime is 2069431703. The next prime is 2069431783. The reversal of 2069431778 is 8771349602.

It can be written as a sum of positive squares in 2 ways, for example, as 2039696569 + 29735209 = 45163^2 + 5453^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=32167.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1221500 + ... + 1223192.

Almost surely, 2^2069431778 is an apocalyptic number.

2069431778 is a deficient number, since it is larger than the sum of its proper divisors (1208627071).

2069431778 is an frugal number, since it uses more digits than its factorization.

2069431778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3426 (or 1714 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 2069431778 is about 45491.0076608553. The cubic root of 2069431778 is about 1274.3352737512.

The spelling of 2069431778 in words is "two billion, sixty-nine million, four hundred thirty-one thousand, seven hundred seventy-eight".