7861428 has 48 divisors (see below), whose sum is σ = 20650560. Its totient is φ = 2585952.

The previous prime is 7861417. The next prime is 7861489. The reversal of 7861428 is 8241687.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 7861392 and 7861401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8526 + ... + 9402.

It is an arithmetic number, because the mean of its divisors is an integer number (430220).

Almost surely, 2^7861428 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 7861428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10325280).

7861428 is an abundant number, since it is smaller than the sum of its proper divisors (12789132).

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

7861428 is a wasteful number, since it uses less digits than its factorization.

7861428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973 (or 965 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 7861428 is about 2803.8238175748. The cubic root of 7861428 is about 198.8385009916.

The spelling of 7861428 in words is "seven million, eight hundred sixty-one thousand, four hundred twenty-eight".