7288638 has 16 divisors (see below), whose sum is σ = 16659840. Its totient is φ = 2082456.

The previous prime is 7288637. The next prime is 7288639. The reversal of 7288638 is 8368827.

It is an interprime number because it is at equal distance from previous prime (7288637) and next prime (7288639).

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 173539 = 7288638 / (7 + 2 + 8 + 8 + 6 + 3 + 8).

It is a self number, because there is not a number n which added to its sum of digits gives 7288638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7288637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86728 + ... + 86811.

It is an arithmetic number, because the mean of its divisors is an integer number (1041240).

Almost surely, 2^7288638 is an apocalyptic number.

7288638 is an abundant number, since it is smaller than the sum of its proper divisors (9371202).

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

7288638 is a wasteful number, since it uses less digits than its factorization.

7288638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173551.

The product of its digits is 129024, while the sum is 42.

The square root of 7288638 is about 2699.7477659959. The cubic root of 7288638 is about 193.8870458773.

The spelling of 7288638 in words is "seven million, two hundred eighty-eight thousand, six hundred thirty-eight".