7481251988 has 54 divisors (see below), whose sum is σ = 15321889674. Its totient is φ = 3186925728.

The previous prime is 7481251927. The next prime is 7481251991. The reversal of 7481251988 is 8891521847.

It can be written as a sum of positive squares in only one way, i.e., 4625632144 + 2855619844 = 68012^2 + 53438^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 21559631 + ... + 21559977.

Almost surely, 2^7481251988 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 7481251988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7660944837).

7481251988 is an abundant number, since it is smaller than the sum of its proper divisors (7840637686).

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

7481251988 is a wasteful number, since it uses less digits than its factorization.

7481251988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029 (or 673 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 53.

The square root of 7481251988 is about 86494.2309521277. The cubic root of 7481251988 is about 1955.8014377528.

The spelling of 7481251988 in words is "seven billion, four hundred eighty-one million, two hundred fifty-one thousand, nine hundred eighty-eight".