1977680256 has 32 divisors (see below), whose sum is σ = 5253214200. Its totient is φ = 659226624.

The previous prime is 1977680219. The next prime is 1977680267. The reversal of 1977680256 is 6520867791.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×1977680256² = 7822438389944451072, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1977680199 and 1977680208.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2574721 + ... + 2575488.

Almost surely, 2^1977680256 is an apocalyptic number.

1977680256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1977680256 is an abundant number, since it is smaller than the sum of its proper divisors (3275533944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1977680256 is an equidigital number, since it uses as much as digits as its factorization.

1977680256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5150226 (or 5150214 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 51.

The square root of 1977680256 is about 44471.1170986293. The cubic root of 1977680256 is about 1255.2166535484.

The spelling of 1977680256 in words is "one billion, nine hundred seventy-seven million, six hundred eighty thousand, two hundred fifty-six".