1977431307108 has 72 divisors (see below), whose sum is σ = 4822832649600. Its totient is φ = 629852654592.

The previous prime is 1977431307041. The next prime is 1977431307109. The reversal of 1977431307108 is 8017031347791.

It is a happy number.

It is a super-2 number, since 2×1977431307108² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1977431307109) 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 23 ways as a sum of consecutive naturals, for example, 2972373 + ... + 3576291.

It is an arithmetic number, because the mean of its divisors is an integer number (66983786800).

Almost surely, 2^{1977431307108} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1977431307108, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2411416324800).

1977431307108 is an abundant number, since it is smaller than the sum of its proper divisors (2845401342492).

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

1977431307108 is a wasteful number, since it uses less digits than its factorization.

1977431307108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604149 (or 604050 counting only the distinct ones).

The product of its (nonzero) digits is 889056, while the sum is 51.

The spelling of 1977431307108 in words is "one trillion, nine hundred seventy-seven billion, four hundred thirty-one million, three hundred seven thousand, one hundred eight".