7421249640 has 256 divisors, whose sum is σ = 26720409600. Its totient is φ = 1612993536.

The previous prime is 7421249639. The next prime is 7421249659. The reversal of 7421249640 is 469421247.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1629847 + ... + 1634393.

It is an arithmetic number, because the mean of its divisors is an integer number (104376600).

Almost surely, 2^7421249640 is an apocalyptic number.

7421249640 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 7421249640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13360204800).

7421249640 is an abundant number, since it is smaller than the sum of its proper divisors (19299159960).

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

7421249640 is a wasteful number, since it uses less digits than its factorization.

7421249640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4664 (or 4660 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 39.

The square root of 7421249640 is about 86146.6751534846. The cubic root of 7421249640 is about 1950.5586512463.

The spelling of 7421249640 in words is "seven billion, four hundred twenty-one million, two hundred forty-nine thousand, six hundred forty".