7251546420 has 72 divisors (see below), whose sum is σ = 22051981224. Its totient is φ = 1928855808.

The previous prime is 7251546409. The next prime is 7251546439. The reversal of 7251546420 is 246451527.

It is a happy number.

7251546420 is a `hidden beast` number, since 7 + 2 + 5 + 1 + 5 + 4 + 642 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 934158096 + 6317388324 = 30564^2 + 79482^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20722 + ... + 122198.

It is an arithmetic number, because the mean of its divisors is an integer number (306277517).

Almost surely, 2^7251546420 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 7251546420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11025990612).

7251546420 is an abundant number, since it is smaller than the sum of its proper divisors (14800434804).

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

7251546420 is a wasteful number, since it uses less digits than its factorization.

7251546420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101889 (or 101884 counting only the distinct ones).

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

The square root of 7251546420 is about 85156.0122363653. The cubic root of 7251546420 is about 1935.5759197507.

Adding to 7251546420 its reverse (246451527), we get a palindrome (7497997947).

The spelling of 7251546420 in words is "seven billion, two hundred fifty-one million, five hundred forty-six thousand, four hundred twenty".