781458428994 has 16 divisors (see below), whose sum is σ = 1654853143968. Its totient is φ = 245163428672.

The previous prime is 781458428987. The next prime is 781458428999. The reversal of 781458428994 is 499824854187.

It is a super-2 number, since 2×781458428994² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (781458428999) 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 7 ways as a sum of consecutive naturals, for example, 3830678472 + ... + 3830678675.

It is an arithmetic number, because the mean of its divisors is an integer number (103428321498).

Almost surely, 2^781458428994 is an apocalyptic number.

781458428994 is an abundant number, since it is smaller than the sum of its proper divisors (873394714974).

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

781458428994 is a wasteful number, since it uses less digits than its factorization.

781458428994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7661357169.

The product of its digits is 185794560, while the sum is 69.

The spelling of 781458428994 in words is "seven hundred eighty-one billion, four hundred fifty-eight million, four hundred twenty-eight thousand, nine hundred ninety-four".