7123428 has 72 divisors (see below), whose sum is σ = 20057856. Its totient is φ = 2116800.

The previous prime is 7123427. The next prime is 7123447. The reversal of 7123428 is 8243217.

7123428 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (7123421) 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, 14263 + ... + 14753.

Almost surely, 2^7123428 is an apocalyptic number.

7123428 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 7123428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10028928).

7123428 is an abundant number, since it is smaller than the sum of its proper divisors (12934428).

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

7123428 is a wasteful number, since it uses less digits than its factorization.

7123428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545 (or 540 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 7123428 is about 2668.9750841849. The cubic root of 7123428 is about 192.4109038416.

The spelling of 7123428 in words is "seven million, one hundred twenty-three thousand, four hundred twenty-eight".