1772978668 has 6 divisors (see below), whose sum is σ = 3102712676. Its totient is φ = 886489332.

The previous prime is 1772978663. The next prime is 1772978677. The reversal of 1772978668 is 8668792771.

It is not an unprimeable number, because it can be changed into a prime (1772978663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221622330 + ... + 221622337.

Almost surely, 2^1772978668 is an apocalyptic number.

It is an amenable number.

1772978668 is a deficient number, since it is larger than the sum of its proper divisors (1329734008).

1772978668 is a wasteful number, since it uses less digits than its factorization.

1772978668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443244671 (or 443244669 counting only the distinct ones).

The product of its digits is 14224896, while the sum is 61.

The square root of 1772978668 is about 42106.7532350809. The cubic root of 1772978668 is about 1210.3226760493.

The spelling of 1772978668 in words is "one billion, seven hundred seventy-two million, nine hundred seventy-eight thousand, six hundred sixty-eight".