1977669680 has 80 divisors (see below), whose sum is σ = 5261954880. Its totient is φ = 677154816.

The previous prime is 1977669671. The next prime is 1977669691. The reversal of 1977669680 is 869667791.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1977669680² = 7822354726382604800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 522836 + ... + 526604.

It is an arithmetic number, because the mean of its divisors is an integer number (65774436).

Almost surely, 2^1977669680 is an apocalyptic number.

1977669680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1977669680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2630977440).

1977669680 is an abundant number, since it is smaller than the sum of its proper divisors (3284285200).

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

1977669680 is a wasteful number, since it uses less digits than its factorization.

1977669680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4726 (or 4720 counting only the distinct ones).

The product of its (nonzero) digits is 6858432, while the sum is 59.

The square root of 1977669680 is about 44470.9981898315. The cubic root of 1977669680 is about 1255.2144160457.

The spelling of 1977669680 in words is "one billion, nine hundred seventy-seven million, six hundred sixty-nine thousand, six hundred eighty".