7861128 has 48 divisors (see below), whose sum is σ = 21609840. Its totient is φ = 2381280.

The previous prime is 7861127. The next prime is 7861141. The reversal of 7861128 is 8211687.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (7861121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1551 + ... + 4257.

It is an arithmetic number, because the mean of its divisors is an integer number (450205).

Almost surely, 2^7861128 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 7861128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10804920).

7861128 is an abundant number, since it is smaller than the sum of its proper divisors (13748712).

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

7861128 is a wasteful number, since it uses less digits than its factorization.

7861128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2738 (or 2723 counting only the distinct ones).

The product of its digits is 5376, while the sum is 33.

The square root of 7861128 is about 2803.7703186959. The cubic root of 7861128 is about 198.8359716670.

The spelling of 7861128 in words is "seven million, eight hundred sixty-one thousand, one hundred twenty-eight".