7245987840 has 816 divisors, whose sum is σ = 32061015168. Its totient is φ = 1528823808.

The previous prime is 7245987787. The next prime is 7245987863. The reversal of 7245987840 is 487895427.

It is a happy number.

7245987840 is a `hidden beast` number, since 7 + 2 + 4 + 598 + 7 + 8 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Saint-Exupery number, since it is equal to the product of the sides of a Pythagorean triangle: 3120 × 3024 × 768.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 557383674 + ... + 557383686.

Almost surely, 2^7245987840 is an apocalyptic number.

7245987840 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7245987840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16030507584).

7245987840 is an abundant number, since it is smaller than the sum of its proper divisors (24815027328).

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

7245987840 is an frugal number, since it uses more digits than its factorization.

7245987840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72 (or 30 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 54.

The square root of 7245987840 is about 85123.3683544067. The cubic root of 7245987840 is about 1935.0812296890.

The spelling of 7245987840 in words is "seven billion, two hundred forty-five million, nine hundred eighty-seven thousand, eight hundred forty".