7728734451 has 4 divisors (see below), whose sum is σ = 10304979272. Its totient is φ = 5152489632.

The previous prime is 7728734437. The next prime is 7728734483. The reversal of 7728734451 is 1544378277.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 7728734451 - 2¹³ = 7728726259 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7728734451.

It is not an unprimeable number, because it can be changed into a prime (7728734411) 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 3 ways as a sum of consecutive naturals, for example, 1288122406 + ... + 1288122411.

It is an arithmetic number, because the mean of its divisors is an integer number (2576244818).

Almost surely, 2^7728734451 is an apocalyptic number.

7728734451 is a deficient number, since it is larger than the sum of its proper divisors (2576244821).

7728734451 is a wasteful number, since it uses less digits than its factorization.

7728734451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2576244820.

The product of its digits is 1317120, while the sum is 48.

The square root of 7728734451 is about 87913.2211388026. The cubic root of 7728734451 is about 1977.1341093906.

The spelling of 7728734451 in words is "seven billion, seven hundred twenty-eight million, seven hundred thirty-four thousand, four hundred fifty-one".