1977769828 has 6 divisors (see below), whose sum is σ = 3461097206. Its totient is φ = 988884912.

The previous prime is 1977769813. The next prime is 1977769841. The reversal of 1977769828 is 8289677791.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1661214564 + 316555264 = 40758^2 + 17792^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1977769828.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247221225 + ... + 247221232.

Almost surely, 2^1977769828 is an apocalyptic number.

It is an amenable number.

1977769828 is a deficient number, since it is larger than the sum of its proper divisors (1483327378).

1977769828 is a wasteful number, since it uses less digits than its factorization.

1977769828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494442461 (or 494442459 counting only the distinct ones).

The product of its digits is 21337344, while the sum is 64.

The square root of 1977769828 is about 44472.1241678425. The cubic root of 1977769828 is about 1255.2356034551.

The spelling of 1977769828 in words is "one billion, nine hundred seventy-seven million, seven hundred sixty-nine thousand, eight hundred twenty-eight".