7218750 has 112 divisors (see below), whose sum is σ = 22499712. Its totient is φ = 1500000.

The previous prime is 7218749. The next prime is 7218763. The reversal of 7218750 is 578127.

It is a happy number.

It is a super-2 number, since 2×7218750² = 104220703125000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a nialpdrome in base 5.

It is a zygodrome in base 5.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 656245 + ... + 656255.

Almost surely, 2^7218750 is an apocalyptic number.

7218750 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 7218750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11249856).

7218750 is an abundant number, since it is smaller than the sum of its proper divisors (15280962).

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

7218750 is an equidigital number, since it uses as much as digits as its factorization.

7218750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53 (or 28 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 7218750 is about 2686.7731575256. The cubic root of 7218750 is about 193.2653513129.

The spelling of 7218750 in words is "seven million, two hundred eighteen thousand, seven hundred fifty".