28515949 has 24 divisors (see below), whose sum is σ = 36235584. Its totient is φ = 21964800.

The previous prime is 28515913. The next prime is 28515983. The reversal of 28515949 is 94951582.

It is not a de Polignac number, because 28515949 - 2¹³ = 28507757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28515449) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 110829 + ... + 111085.

It is an arithmetic number, because the mean of its divisors is an integer number (1509816).

Almost surely, 2^28515949 is an apocalyptic number.

It is an amenable number.

28515949 is a deficient number, since it is larger than the sum of its proper divisors (7719635).

28515949 is a wasteful number, since it uses less digits than its factorization.

28515949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417 (or 406 counting only the distinct ones).

The product of its digits is 129600, while the sum is 43.

The square root of 28515949 is about 5340.0326778026. The cubic root of 28515949 is about 305.5127056949.

The spelling of 28515949 in words is "twenty-eight million, five hundred fifteen thousand, nine hundred forty-nine".