7621538624 has 56 divisors (see below), whose sum is σ = 17394814080. Its totient is φ = 3245538816.

The previous prime is 7621538623. The next prime is 7621538627. The reversal of 7621538624 is 4268351267.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7621538623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16157 + ... + 124515.

It is an arithmetic number, because the mean of its divisors is an integer number (310621680).

Almost surely, 2^7621538624 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 7621538624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8697407040).

7621538624 is an abundant number, since it is smaller than the sum of its proper divisors (9773275456).

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

7621538624 is a wasteful number, since it uses less digits than its factorization.

7621538624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108535 (or 108525 counting only the distinct ones).

The product of its digits is 483840, while the sum is 44.

The square root of 7621538624 is about 87301.4239517317. The cubic root of 7621538624 is about 1967.9507170332.

The spelling of 7621538624 in words is "seven billion, six hundred twenty-one million, five hundred thirty-eight thousand, six hundred twenty-four".