7428721784 has 16 divisors (see below), whose sum is σ = 15195112920. Its totient is φ = 3376691680.

The previous prime is 7428721763. The next prime is 7428721789. The reversal of 7428721784 is 4871278247.

It is a super-2 number, since 2×7428721784² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7428721789) 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, 42208559 + ... + 42208734.

Almost surely, 2^7428721784 is an apocalyptic number.

It is an amenable number.

7428721784 is an abundant number, since it is smaller than the sum of its proper divisors (7766391136).

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

7428721784 is a wasteful number, since it uses less digits than its factorization.

7428721784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84417310 (or 84417306 counting only the distinct ones).

The product of its digits is 1404928, while the sum is 50.

The square root of 7428721784 is about 86190.0329736565. The cubic root of 7428721784 is about 1951.2130768018.

The spelling of 7428721784 in words is "seven billion, four hundred twenty-eight million, seven hundred twenty-one thousand, seven hundred eighty-four".