7820615520 has 288 divisors, whose sum is σ = 28227273984. Its totient is φ = 1968537600.

The previous prime is 7820615501. The next prime is 7820615527. The reversal of 7820615520 is 255160287.

It is a happy number.

7820615520 is a `hidden beast` number, since 78 + 2 + 0 + 61 + 5 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a super-2 number, since 2×7820615520² (a number of 21 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7820615527) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1828104 + ... + 1832376.

It is an arithmetic number, because the mean of its divisors is an integer number (98011368).

Almost surely, 2^7820615520 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 7820615520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14113636992).

7820615520 is an abundant number, since it is smaller than the sum of its proper divisors (20406658464).

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

7820615520 is a wasteful number, since it uses less digits than its factorization.

7820615520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4366 (or 4355 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 7820615520 is about 88434.2440460708. The cubic root of 7820615520 is about 1984.9381483899.

The spelling of 7820615520 in words is "seven billion, eight hundred twenty million, six hundred fifteen thousand, five hundred twenty".