7855181620 has 96 divisors (see below), whose sum is σ = 19418507136. Its totient is φ = 2631436800.

The previous prime is 7855181611. The next prime is 7855181671. The reversal of 7855181620 is 261815587.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1590555 + ... + 1595485.

It is an arithmetic number, because the mean of its divisors is an integer number (202276116).

Almost surely, 2^7855181620 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 7855181620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9709253568).

7855181620 is an abundant number, since it is smaller than the sum of its proper divisors (11563325516).

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

7855181620 is a wasteful number, since it uses less digits than its factorization.

7855181620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5521 (or 5519 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 43.

The square root of 7855181620 is about 88629.4624828561. The cubic root of 7855181620 is about 1987.8582396585.

The spelling of 7855181620 in words is "seven billion, eight hundred fifty-five million, one hundred eighty-one thousand, six hundred twenty".