3155120640 has 320 divisors, whose sum is σ = 12810251520. Its totient is φ = 721059840.

The previous prime is 3155120623. The next prime is 3155120641. The reversal of 3155120640 is 460215513.

3155120640 is a `hidden beast` number, since 3 + 1 + 5 + 5 + 12 + 0 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (320).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (3155120641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 480580 + ... + 487100.

It is an arithmetic number, because the mean of its divisors is an integer number (40032036).

Almost surely, 2^3155120640 is an apocalyptic number.

3155120640 is a gapful number since it is divisible by the number (30) 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 3155120640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6405125760).

3155120640 is an abundant number, since it is smaller than the sum of its proper divisors (9655130880).

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

3155120640 is an equidigital number, since it uses as much as digits as its factorization.

3155120640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6560 (or 6538 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 3155120640 is about 56170.4605642503. The cubic root of 3155120640 is about 1466.6910996848.

The spelling of 3155120640 in words is "three billion, one hundred fifty-five million, one hundred twenty thousand, six hundred forty".