7638491690 has 32 divisors (see below), whose sum is σ = 13980802176. Its totient is φ = 3004182720.

The previous prime is 7638491687. The next prime is 7638491717. The reversal of 7638491690 is 961948367.

It is a super-3 number, since 3×7638491690³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 250409 + ... + 279251.

It is an arithmetic number, because the mean of its divisors is an integer number (436900068).

Almost surely, 2^7638491690 is an apocalyptic number.

7638491690 is a deficient number, since it is larger than the sum of its proper divisors (6342310486).

7638491690 is a wasteful number, since it uses less digits than its factorization.

7638491690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29294.

The product of its (nonzero) digits is 1959552, while the sum is 53.

The square root of 7638491690 is about 87398.4650322876. The cubic root of 7638491690 is about 1969.4087818489.

The spelling of 7638491690 in words is "seven billion, six hundred thirty-eight million, four hundred ninety-one thousand, six hundred ninety".