7649889381 has 24 divisors (see below), whose sum is σ = 12103280280. Its totient is φ = 4634413056.

The previous prime is 7649889371. The next prime is 7649889389. The reversal of 7649889381 is 1839889467.

7649889381 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 4960948356 + 2688941025 = 70434^2 + 51855^2 .

It is not a de Polignac number, because 7649889381 - 2⁵ = 7649889349 is a prime.

It is a super-2 number, since 2×7649889381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7649889389) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 857620 + ... + 866493.

It is an arithmetic number, because the mean of its divisors is an integer number (504303345).

Almost surely, 2^7649889381 is an apocalyptic number.

It is an amenable number.

7649889381 is a deficient number, since it is larger than the sum of its proper divisors (4453390899).

7649889381 is a wasteful number, since it uses less digits than its factorization.

7649889381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1724165 (or 1724162 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 63.

The square root of 7649889381 is about 87463.6460536605. The cubic root of 7649889381 is about 1970.3878389004.

The spelling of 7649889381 in words is "seven billion, six hundred forty-nine million, eight hundred eighty-nine thousand, three hundred eighty-one".