7994686440 has 128 divisors (see below), whose sum is σ = 26267068800. Its totient is φ = 1934545920.

The previous prime is 7994686421. The next prime is 7994686457. The reversal of 7994686440 is 446864997.

It is a super-2 number, since 2×7994686440² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48610 + ... + 135470.

It is an arithmetic number, because the mean of its divisors is an integer number (205211475).

Almost surely, 2^7994686440 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 7994686440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13133534400).

7994686440 is an abundant number, since it is smaller than the sum of its proper divisors (18272382360).

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

7994686440 is a wasteful number, since it uses less digits than its factorization.

7994686440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86947 (or 86943 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 57.

The square root of 7994686440 is about 89413.0104626838. The cubic root of 7994686440 is about 1999.5571052627.

The spelling of 7994686440 in words is "seven billion, nine hundred ninety-four million, six hundred eighty-six thousand, four hundred forty".