28911982 has 16 divisors (see below), whose sum is σ = 47705904. Its totient is φ = 13140600.

The previous prime is 28911973. The next prime is 28911983.

28911982 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28911983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2769 + ... + 8092.

It is an arithmetic number, because the mean of its divisors is an integer number (2981619).

Almost surely, 2^28911982 is an apocalyptic number.

28911982 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

28911982 is a deficient number, since it is larger than the sum of its proper divisors (18793922).

28911982 is a wasteful number, since it uses less digits than its factorization.

28911982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10896 (or 10874 counting only the distinct ones).

The product of its digits is 20736, while the sum is 40.

The square root of 28911982 is about 5376.9863306503. The cubic root of 28911982 is about 306.9205409272.

The spelling of 28911982 in words is "twenty-eight million, nine hundred eleven thousand, nine hundred eighty-two".