781988057552 has 40 divisors (see below), whose sum is σ = 1632001144200. Its totient is φ = 360839485440.

The previous prime is 781988057467. The next prime is 781988057563. The reversal of 781988057552 is 255750889187.

It can be written as a sum of positive squares in 4 ways, for example, as 343775832976 + 438212224576 = 586324^2 + 661976^2 .

It is a super-2 number, since 2×781988057552² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 562652 + ... + 1371332.

It is an arithmetic number, because the mean of its divisors is an integer number (40800028605).

Almost surely, 2^781988057552 is an apocalyptic number.

It is an amenable number.

781988057552 is an abundant number, since it is smaller than the sum of its proper divisors (850013086648).

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

781988057552 is a wasteful number, since it uses less digits than its factorization.

781988057552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813351 (or 813345 counting only the distinct ones).

The product of its (nonzero) digits is 56448000, while the sum is 65.

The spelling of 781988057552 in words is "seven hundred eighty-one billion, nine hundred eighty-eight million, fifty-seven thousand, five hundred fifty-two".