7638655 has 4 divisors (see below), whose sum is σ = 9166392. Its totient is φ = 6110920.

The previous prime is 7638643. The next prime is 7638689. The reversal of 7638655 is 5568367.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 7638655 - 2⁹ = 7638143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 763861 + ... + 763870.

It is an arithmetic number, because the mean of its divisors is an integer number (2291598).

Almost surely, 2^7638655 is an apocalyptic number.

7638655 is a deficient number, since it is larger than the sum of its proper divisors (1527737).

7638655 is a wasteful number, since it uses less digits than its factorization.

7638655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1527736.

The product of its digits is 151200, while the sum is 40.

The square root of 7638655 is about 2763.8116795469. The cubic root of 7638655 is about 196.9422816987.

The spelling of 7638655 in words is "seven million, six hundred thirty-eight thousand, six hundred fifty-five".