781148457 has 12 divisors (see below), whose sum is σ = 1134849924. Its totient is φ = 517754400.

The previous prime is 781148411. The next prime is 781148513. The reversal of 781148457 is 754841187.

781148457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 395850816 + 385297641 = 19896^2 + 19629^2 .

It is not a de Polignac number, because 781148457 - 2⁸ = 781148201 is a prime.

It is a super-2 number, since 2×781148457² = 1220385823746961698, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (781548457) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 249294 + ... + 252407.

It is an arithmetic number, because the mean of its divisors is an integer number (94570827).

Almost surely, 2^781148457 is an apocalyptic number.

It is an amenable number.

781148457 is a deficient number, since it is larger than the sum of its proper divisors (353701467).

781148457 is a wasteful number, since it uses less digits than its factorization.

781148457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501880 (or 501877 counting only the distinct ones).

The product of its digits is 250880, while the sum is 45.

The square root of 781148457 is about 27949.0332033149. The cubic root of 781148457 is about 920.9679702527.

The spelling of 781148457 in words is "seven hundred eighty-one million, one hundred forty-eight thousand, four hundred fifty-seven".