7420521456 has 100 divisors (see below), whose sum is σ = 21496650912. Its totient is φ = 2471261184.

The previous prime is 7420521443. The next prime is 7420521457. The reversal of 7420521456 is 6541250247.

It is a happy number.

7420521456 is a `hidden beast` number, since 74 + 20 + 521 + 45 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 7420521456.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7420521457) 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 19 ways as a sum of consecutive naturals, for example, 2049760 + ... + 2053376.

Almost surely, 2^7420521456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7420521456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10748325456).

7420521456 is an abundant number, since it is smaller than the sum of its proper divisors (14076129456).

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

7420521456 is a wasteful number, since it uses less digits than its factorization.

7420521456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5220 (or 5205 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 36.

The square root of 7420521456 is about 86142.4486301614. The cubic root of 7420521456 is about 1950.4948519255.

The spelling of 7420521456 in words is "seven billion, four hundred twenty million, five hundred twenty-one thousand, four hundred fifty-six".