28007988 has 12 divisors (see below), whose sum is σ = 65352000. Its totient is φ = 9335992.

The previous prime is 28007981. The next prime is 28008017. The reversal of 28007988 is 88970082.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28007981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1166988 + ... + 1167011.

It is an arithmetic number, because the mean of its divisors is an integer number (5446000).

Almost surely, 2^28007988 is an apocalyptic number.

It is an amenable number.

28007988 is an abundant number, since it is smaller than the sum of its proper divisors (37344012).

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

28007988 is a wasteful number, since it uses less digits than its factorization.

28007988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2334006 (or 2334004 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 28007988 is about 5292.2573633564. The cubic root of 28007988 is about 303.6877709571.

The spelling of 28007988 in words is "twenty-eight million, seven thousand, nine hundred eighty-eight".