781250000128 has 36 divisors (see below), whose sum is σ = 1679405806708. Its totient is φ = 360576921600.

The previous prime is 781250000099. The next prime is 781250000143. The reversal of 781250000128 is 821000052187.

It can be written as a sum of positive squares in 2 ways, for example, as 390615000064 + 390635000064 = 624992^2 + 625008^2 .

It is a sliding number, since 781250000128 = 128 + 781250000000 and 1/128 + 1/781250000000 = 0.00781250000128.

It is a super-2 number, since 2×781250000128² (a number of 25 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 781250000093 and 781250000102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117371973 + ... + 117378628.

Almost surely, 2^781250000128 is an apocalyptic number.

It is an amenable number.

781250000128 is an abundant number, since it is smaller than the sum of its proper divisors (898155806580).

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

781250000128 is a wasteful number, since it uses less digits than its factorization.

781250000128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234750630 (or 234750616 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 34.

It can be divided in two parts, 781250000 and 128, that multiplied together give a 11-th power (100000000000 = 10¹¹).

The spelling of 781250000128 in words is "seven hundred eighty-one billion, two hundred fifty million, one hundred twenty-eight", and thus it is an aban number.