781454428 has 6 divisors (see below), whose sum is σ = 1367545256. Its totient is φ = 390727212.

The previous prime is 781454423. The next prime is 781454441. The reversal of 781454428 is 824454187.

It is a super-2 number, since 2×781454428² = 1221342046081614368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781454423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97681800 + ... + 97681807.

Almost surely, 2^781454428 is an apocalyptic number.

It is an amenable number.

781454428 is a deficient number, since it is larger than the sum of its proper divisors (586090828).

781454428 is a wasteful number, since it uses less digits than its factorization.

781454428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195363611 (or 195363609 counting only the distinct ones).

The product of its digits is 286720, while the sum is 43.

The square root of 781454428 is about 27954.5063987902. The cubic root of 781454428 is about 921.0882003680.

The spelling of 781454428 in words is "seven hundred eighty-one million, four hundred fifty-four thousand, four hundred twenty-eight".