1966256428 has 6 divisors (see below), whose sum is σ = 3440948756. Its totient is φ = 983128212.

The previous prime is 1966256423. The next prime is 1966256443. The reversal of 1966256428 is 8246526691.

It is not an unprimeable number, because it can be changed into a prime (1966256423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245782050 + ... + 245782057.

Almost surely, 2^1966256428 is an apocalyptic number.

It is an amenable number.

1966256428 is a deficient number, since it is larger than the sum of its proper divisors (1474692328).

1966256428 is a wasteful number, since it uses less digits than its factorization.

1966256428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491564111 (or 491564109 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 49.

The square root of 1966256428 is about 44342.4900969713. The cubic root of 1966256428 is about 1252.7951165070.

The spelling of 1966256428 in words is "one billion, nine hundred sixty-six million, two hundred fifty-six thousand, four hundred twenty-eight".