7255638 has 48 divisors (see below), whose sum is σ = 17153136. Its totient is φ = 2203200.

The previous prime is 7255627. The next prime is 7255639. The reversal of 7255638 is 8365527.

7255638 is a `hidden beast` number, since 72 + 556 + 38 = 666.

It is a d-powerful number, because it can be written as 7⁷ + 2²² + 5⁴ + 5⁹ + 6⁷ + 3² + 8⁴ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7255639) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23481 + ... + 23787.

It is an arithmetic number, because the mean of its divisors is an integer number (357357).

Almost surely, 2^7255638 is an apocalyptic number.

7255638 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 7255638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8576568).

7255638 is an abundant number, since it is smaller than the sum of its proper divisors (9897498).

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

7255638 is a wasteful number, since it uses less digits than its factorization.

7255638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429 (or 426 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 7255638 is about 2693.6291504214. The cubic root of 7255638 is about 193.5939891527.

The spelling of 7255638 in words is "seven million, two hundred fifty-five thousand, six hundred thirty-eight".