7638990 has 32 divisors (see below), whose sum is σ = 19132416. Its totient is φ = 1948320.

The previous prime is 7638979. The next prime is 7638991. The reversal of 7638990 is 998367.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7638991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4846 + ... + 6225.

It is an arithmetic number, because the mean of its divisors is an integer number (597888).

Almost surely, 2^7638990 is an apocalyptic number.

7638990 is an abundant number, since it is smaller than the sum of its proper divisors (11493426).

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

7638990 is a wasteful number, since it uses less digits than its factorization.

7638990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11104.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 7638990 is about 2763.8722835905. The cubic root of 7638990 is about 196.9451606828.

The spelling of 7638990 in words is "seven million, six hundred thirty-eight thousand, nine hundred ninety".