7887428 has 6 divisors (see below), whose sum is σ = 13803006. Its totient is φ = 3943712.

The previous prime is 7887427. The next prime is 7887469. The reversal of 7887428 is 8247887.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 6801664 + 1085764 = 2608^2 + 1042^2 .

It is not an unprimeable number, because it can be changed into a prime (7887421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 985925 + ... + 985932.

It is an arithmetic number, because the mean of its divisors is an integer number (2300501).

Almost surely, 2^7887428 is an apocalyptic number.

It is an amenable number.

7887428 is a deficient number, since it is larger than the sum of its proper divisors (5915578).

7887428 is a wasteful number, since it uses less digits than its factorization.

7887428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1971861 (or 1971859 counting only the distinct ones).

The product of its digits is 200704, while the sum is 44.

The square root of 7887428 is about 2808.4565155971. The cubic root of 7887428 is about 199.0574651177.

The spelling of 7887428 in words is "seven million, eight hundred eighty-seven thousand, four hundred twenty-eight".