7938470864 has 60 divisors (see below), whose sum is σ = 16274376900. Its totient is φ = 3750727680.

The previous prime is 7938470863. The next prime is 7938470873. The reversal of 7938470864 is 4680748397.

It can be written as a sum of positive squares in 2 ways, for example, as 6465446464 + 1473024400 = 80408^2 + 38380^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7938470863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2591894 + ... + 2594954.

It is an arithmetic number, because the mean of its divisors is an integer number (271239615).

Almost surely, 2^7938470864 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 7938470864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8137188450).

7938470864 is an abundant number, since it is smaller than the sum of its proper divisors (8335906036).

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

7938470864 is a wasteful number, since it uses less digits than its factorization.

7938470864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3556 (or 3531 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 56.

The square root of 7938470864 is about 89098.0968595851. The cubic root of 7938470864 is about 1994.8593702836.

The spelling of 7938470864 in words is "seven billion, nine hundred thirty-eight million, four hundred seventy thousand, eight hundred sixty-four".