1964616977 has 8 divisors (see below), whose sum is σ = 2034550440. Its totient is φ = 1894829440.

The previous prime is 1964616961. The next prime is 1964616989. The reversal of 1964616977 is 7796164691.

It is a happy number.

It is a Cunningham number, because it is equal to 44324²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1030153216 + 934463761 = 32096^2 + 30569^2 .

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 1964616977 - 2⁴ = 1964616961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1964616377) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8708 + ... + 63285.

It is an arithmetic number, because the mean of its divisors is an integer number (254318805).

Almost surely, 2^1964616977 is an apocalyptic number.

It is an amenable number.

1964616977 is a deficient number, since it is larger than the sum of its proper divisors (69933463).

1964616977 is an equidigital number, since it uses as much as digits as its factorization.

1964616977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72963.

The product of its digits is 3429216, while the sum is 56.

The square root of 1964616977 is about 44324.0000112806. Note that the first 4 decimals coincide. The cubic root of 1964616977 is about 1252.4468290569.

The spelling of 1964616977 in words is "one billion, nine hundred sixty-four million, six hundred sixteen thousand, nine hundred seventy-seven".