7831428 has 48 divisors (see below), whose sum is σ = 20213760. Its totient is φ = 2340000.

The previous prime is 7831423. The next prime is 7831433. The reversal of 7831428 is 8241387.

It is an interprime number because it is at equal distance from previous prime (7831423) and next prime (7831433).

It is a super-2 number, since 2×7831428² = 122662529038368, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7831423) 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, 10053 + ... + 10803.

It is an arithmetic number, because the mean of its divisors is an integer number (421120).

Almost surely, 2^7831428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7831428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10106880).

7831428 is an abundant number, since it is smaller than the sum of its proper divisors (12382332).

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

7831428 is a wasteful number, since it uses less digits than its factorization.

7831428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848 (or 846 counting only the distinct ones).

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

The square root of 7831428 is about 2798.4688670771. The cubic root of 7831428 is about 198.5852493332.

It can be divided in two parts, 783 and 1428, that added together give a triangular number (2211 = T₆₆).

The spelling of 7831428 in words is "seven million, eight hundred thirty-one thousand, four hundred twenty-eight".