7639413894 has 144 divisors (see below), whose sum is σ = 19572181200. Its totient is φ = 2147015808.

The previous prime is 7639413893. The next prime is 7639413907. The reversal of 7639413894 is 4983149367.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 7639413894.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7639413893) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 22015429 + ... + 22015775.

It is an arithmetic number, because the mean of its divisors is an integer number (135917925).

Almost surely, 2^7639413894 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7639413894, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9786090600).

7639413894 is an abundant number, since it is smaller than the sum of its proper divisors (11932767306).

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

7639413894 is a wasteful number, since it uses less digits than its factorization.

7639413894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707 (or 697 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The square root of 7639413894 is about 87403.7407323050. The cubic root of 7639413894 is about 1969.4880349983.

The spelling of 7639413894 in words is "seven billion, six hundred thirty-nine million, four hundred thirteen thousand, eight hundred ninety-four".