1977075649 has 8 divisors (see below), whose sum is σ = 2040824808. Its totient is φ = 1913869440.

The previous prime is 1977075641. The next prime is 1977075671. The reversal of 1977075649 is 9465707791.

It can be written as a sum of positive squares in 4 ways, for example, as 1813056400 + 164019249 = 42580^2 + 12807^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1977075649 - 2³ = 1977075641 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1977075649.

It is not an unprimeable number, because it can be changed into a prime (1977075641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128332 + ... + 142909.

It is an arithmetic number, because the mean of its divisors is an integer number (255103101).

Almost surely, 2^1977075649 is an apocalyptic number.

It is an amenable number.

1977075649 is a deficient number, since it is larger than the sum of its proper divisors (63749159).

1977075649 is a wasteful number, since it uses less digits than its factorization.

1977075649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271475.

The product of its (nonzero) digits is 3333960, while the sum is 55.

The square root of 1977075649 is about 44464.3188298213. The cubic root of 1977075649 is about 1255.0887275565.

The spelling of 1977075649 in words is "one billion, nine hundred seventy-seven million, seventy-five thousand, six hundred forty-nine".