2311308447990 has 128 divisors (see below), whose sum is σ = 6079265136000. Its totient is φ = 559786622976.

The previous prime is 2311308447989. The next prime is 2311308447997. The reversal of 2311308447990 is 997448031132.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2311308447997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 27896946 + ... + 27979674.

It is an arithmetic number, because the mean of its divisors is an integer number (47494258875).

Almost surely, 2^{2311308447990} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2311308447990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3039632568000).

2311308447990 is an abundant number, since it is smaller than the sum of its proper divisors (3767956688010).

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

2311308447990 is a wasteful number, since it uses less digits than its factorization.

2311308447990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84674.

The product of its (nonzero) digits is 1306368, while the sum is 51.

The spelling of 2311308447990 in words is "two trillion, three hundred eleven billion, three hundred eight million, four hundred forty-seven thousand, nine hundred ninety".