7318428 has 48 divisors (see below), whose sum is σ = 18834816. Its totient is φ = 2197440.

The previous prime is 7318397. The next prime is 7318429. The reversal of 7318428 is 8248137.

It is an Ulam number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7318429) 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, 6163 + ... + 7253.

It is an arithmetic number, because the mean of its divisors is an integer number (392392).

Almost surely, 2^7318428 is an apocalyptic number.

7318428 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7318428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9417408).

7318428 is an abundant number, since it is smaller than the sum of its proper divisors (11516388).

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

7318428 is a wasteful number, since it uses less digits than its factorization.

7318428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1154 (or 1152 counting only the distinct ones).

The product of its digits is 10752, while the sum is 33.

The square root of 7318428 is about 2705.2593221353. The cubic root of 7318428 is about 194.1508374512.

The spelling of 7318428 in words is "seven million, three hundred eighteen thousand, four hundred twenty-eight".