7816487994 has 192 divisors, whose sum is σ = 20568637440. Its totient is φ = 2098586880.

The previous prime is 7816487989. The next prime is 7816488023. The reversal of 7816487994 is 4997846187.

It is a super-2 number, since 2×7816487994² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 22525729 + ... + 22526075.

It is an arithmetic number, because the mean of its divisors is an integer number (107128320).

Almost surely, 2^7816487994 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7816487994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10284318720).

7816487994 is an abundant number, since it is smaller than the sum of its proper divisors (12752149446).

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

7816487994 is a wasteful number, since it uses less digits than its factorization.

7816487994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545 (or 542 counting only the distinct ones).

The product of its digits is 24385536, while the sum is 63.

The square root of 7816487994 is about 88410.9042709099. The cubic root of 7816487994 is about 1984.5888866406.

The spelling of 7816487994 in words is "seven billion, eight hundred sixteen million, four hundred eighty-seven thousand, nine hundred ninety-four".