28661915 has 16 divisors (see below), whose sum is σ = 36547200. Its totient is φ = 21504000.

The previous prime is 28661903. The next prime is 28661953. The reversal of 28661915 is 51916682.

It is not a de Polignac number, because 28661915 - 2¹⁴ = 28645531 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37790 + ... + 38540.

It is an arithmetic number, because the mean of its divisors is an integer number (2284200).

Almost surely, 2^28661915 is an apocalyptic number.

28661915 is a deficient number, since it is larger than the sum of its proper divisors (7885285).

28661915 is a wasteful number, since it uses less digits than its factorization.

28661915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222.

The product of its digits is 25920, while the sum is 38.

The square root of 28661915 is about 5353.6823775790. The cubic root of 28661915 is about 306.0330997843.

The spelling of 28661915 in words is "twenty-eight million, six hundred sixty-one thousand, nine hundred fifteen".