7823906640 has 800 divisors, whose sum is σ = 32084553600. Its totient is φ = 1746800640.

The previous prime is 7823906639. The next prime is 7823906681. The reversal of 7823906640 is 466093287.

It is a super-2 number, since 2×7823906640² (a number of 21 digits) contains 22 as substring.

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

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 71778906 + ... + 71779014.

It is an arithmetic number, because the mean of its divisors is an integer number (40105692).

Almost surely, 2^7823906640 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 7823906640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16042276800).

7823906640 is an abundant number, since it is smaller than the sum of its proper divisors (24260646960).

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

7823906640 is a wasteful number, since it uses less digits than its factorization.

7823906640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217 (or 202 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 7823906640 is about 88452.8498127675. The cubic root of 7823906640 is about 1985.2165473413.

The spelling of 7823906640 in words is "seven billion, eight hundred twenty-three million, nine hundred six thousand, six hundred forty".