28999540 has 12 divisors (see below), whose sum is σ = 60899076. Its totient is φ = 11599808.

The previous prime is 28999513. The next prime is 28999549. The reversal of 28999540 is 4599982.

It can be written as a sum of positive squares in 2 ways, for example, as 22829284 + 6170256 = 4778^2 + 2484^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28999549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 724969 + ... + 725008.

It is an arithmetic number, because the mean of its divisors is an integer number (5074923).

Almost surely, 2^28999540 is an apocalyptic number.

28999540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28999540 is an abundant number, since it is smaller than the sum of its proper divisors (31899536).

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

28999540 is a wasteful number, since it uses less digits than its factorization.

28999540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449986 (or 1449984 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 28999540 is about 5385.1220970374. The cubic root of 28999540 is about 307.2300581166.

The spelling of 28999540 in words is "twenty-eight million, nine hundred ninety-nine thousand, five hundred forty".