28411988 has 12 divisors (see below), whose sum is σ = 54241152. Its totient is φ = 12914520.

The previous prime is 28411987. The next prime is 28411991. The reversal of 28411988 is 88911482.

It is a super-2 number, since 2×28411988² = 1614482124224288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28411987) 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, 322820 + ... + 322907.

It is an arithmetic number, because the mean of its divisors is an integer number (4520096).

Almost surely, 2^28411988 is an apocalyptic number.

It is an amenable number.

28411988 is a deficient number, since it is larger than the sum of its proper divisors (25829164).

28411988 is a wasteful number, since it uses less digits than its factorization.

28411988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645742 (or 645740 counting only the distinct ones).

The product of its digits is 36864, while the sum is 41.

The square root of 28411988 is about 5330.2896731791. The cubic root of 28411988 is about 305.1409829275.

The spelling of 28411988 in words is "twenty-eight million, four hundred eleven thousand, nine hundred eighty-eight".