7621732138 has 16 divisors (see below), whose sum is σ = 11601204480. Its totient is φ = 3754863216.

The previous prime is 7621732127. The next prime is 7621732163. The reversal of 7621732138 is 8312371267.

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 7621732138.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27420 + ... + 126472.

It is an arithmetic number, because the mean of its divisors is an integer number (725075280).

Almost surely, 2^7621732138 is an apocalyptic number.

7621732138 is a deficient number, since it is larger than the sum of its proper divisors (3979472342).

7621732138 is a wasteful number, since it uses less digits than its factorization.

7621732138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99621.

The product of its digits is 84672, while the sum is 40.

The square root of 7621732138 is about 87302.5322542250. The cubic root of 7621732138 is about 1967.9673725849.

The spelling of 7621732138 in words is "seven billion, six hundred twenty-one million, seven hundred thirty-two thousand, one hundred thirty-eight".