1977904214520 has 64 divisors (see below), whose sum is σ = 6390152082720. Its totient is φ = 486868729344.

The previous prime is 1977904214509. The next prime is 1977904214521. The reversal of 1977904214520 is 254124097791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1977904214521) 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 15 ways as a sum of consecutive naturals, for example, 633942099 + ... + 633945218.

Almost surely, 2^{1977904214520} is an apocalyptic number.

1977904214520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1977904214520 is an abundant number, since it is smaller than the sum of its proper divisors (4412247868200).

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

1977904214520 is a wasteful number, since it uses less digits than its factorization.

1977904214520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1267887344 (or 1267887340 counting only the distinct ones).

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

The spelling of 1977904214520 in words is "one trillion, nine hundred seventy-seven billion, nine hundred four million, two hundred fourteen thousand, five hundred twenty".