28401489 has 16 divisors (see below), whose sum is σ = 42973440. Its totient is φ = 18530640.

The previous prime is 28401467. The next prime is 28401497. The reversal of 28401489 is 98410482.

It is not a de Polignac number, because 28401489 - 2¹² = 28397393 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28401419) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9922 + ... + 12459.

It is an arithmetic number, because the mean of its divisors is an integer number (2685840).

Almost surely, 2^28401489 is an apocalyptic number.

It is an amenable number.

28401489 is a deficient number, since it is larger than the sum of its proper divisors (14571951).

28401489 is a wasteful number, since it uses less digits than its factorization.

28401489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22437 (or 22431 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 28401489 is about 5329.3047388942. The cubic root of 28401489 is about 305.1033923410.

The spelling of 28401489 in words is "twenty-eight million, four hundred one thousand, four hundred eighty-nine".