23118891390 has 288 divisors, whose sum is σ = 72565549056. Its totient is φ = 5086488960.

The previous prime is 23118891373. The next prime is 23118891407. The reversal of 23118891390 is 9319881132.

It is an interprime number because it is at equal distance from previous prime (23118891373) and next prime (23118891407).

It is a super-2 number, since 2×23118891390² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 35954409 + ... + 35955051.

It is an arithmetic number, because the mean of its divisors is an integer number (251963712).

Almost surely, 2^23118891390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23118891390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36282774528).

23118891390 is an abundant number, since it is smaller than the sum of its proper divisors (49446657666).

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

23118891390 is a wasteful number, since it uses less digits than its factorization.

23118891390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964 (or 954 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The spelling of 23118891390 in words is "twenty-three billion, one hundred eighteen million, eight hundred ninety-one thousand, three hundred ninety".