6891458450 has 12 divisors (see below), whose sum is σ = 12818112810. Its totient is φ = 2756583360.

The previous prime is 6891458381. The next prime is 6891458459. The reversal of 6891458450 is 548541986.

It can be written as a sum of positive squares in 3 ways, for example, as 2884441849 + 4007016601 = 53707^2 + 63301^2 .

It is a Harshad number since it is a multiple of its sum of digits (50), and also a Moran number because the ratio is a prime number: 137829169 = 6891458450 / (6 + 8 + 9 + 1 + 4 + 5 + 8 + 4 + 5 + 0).

It is not an unprimeable number, because it can be changed into a prime (6891458459) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 68914535 + ... + 68914634.

Almost surely, 2^6891458450 is an apocalyptic number.

6891458450 is a deficient number, since it is larger than the sum of its proper divisors (5926654360).

6891458450 is a wasteful number, since it uses less digits than its factorization.

6891458450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137829181 (or 137829176 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 50.

The square root of 6891458450 is about 83014.8086187037. The cubic root of 6891458450 is about 1902.9923715390.

The spelling of 6891458450 in words is "six billion, eight hundred ninety-one million, four hundred fifty-eight thousand, four hundred fifty".